Mercurial > hg > webaudioevaluationtool

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">

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		<title>Analysis</title>
		<meta name="description" content="Show results from subjective evaluation">
		<meta name="author" content="Brecht De Man">

		<script type="text/javascript" src="https://www.google.com/jsapi"></script>
		<script type="text/javascript">
			// To aid 'one-page set-up' all scripts and CSS must be included directly in this file!

			google.load("visualization", "1", {packages:["corechart"]});

			/*************
			*	SETUP   *
			*************/
			// folder where to find the XML files
			xmlFileFolder = "saves";
			// array of XML files
			// THIS IS WHERE YOU SPECIFY RESULT XML FILES TO ANALYSE
			var xmlFiles = ['test-0.xml','test-1.xml','test-2.xml','test-3.xml'];


			//TODO: make retrieval of file names automatic / drag files on here

			/****************
			*	VARIABLES  *
			****************/

			// Counters
			// How many files, audioholders, audioelementes and statements annotated (don't count current one)
			var numberOfFiles = -1;
			var numberOfaudioholders = -1;
			var numberOfaudioelementes = -1;
			var numberOfStatements = -1;
			var numberOfSkippedComments = 0;

			// Object arrays
			var fileNameArray = [];
			var subjectArray = [];
			var audioholderArray = [];
			var audioelementArray = [];

			// End of (file, audioholder, audioelement) flags
			var newFile = true;
			var newAudioHolder = true;
			var newAudioElement = true;

			var fileCounter = 0;		// file index
			var audioholderCounter=0;	// audioholder index (current XML file)
			var audioelementCounter=0;	// audioelement index (current audioholder)
			var statementNumber=0; 		// total number of statements

			var root;					// root of XML file
			var commentInFull = '';		// full comment

			var playAudio = true;		// whether corresponding audio should be played back

			// // Measuring time
			// var lastTimeMeasured = -1;	//
			// var durationLastAnnotation = -1;	// duration of last annotation
			// var timeArray = [];
			// var MIN_TIME = 1.0;	// minimum time counted as significant
			// var measurementPaused = false; // whether time measurement is paused
			// var timeInBuffer = 0; //

			var topLevel;
			window.onload = function() {
				// Initialise page
				topLevel = document.getElementById('topLevelBody');
				var setup = document.createElement('div');
				setup.id = 'setupTagDiv';
				loadAllFiles();
				makePlots();
				printSurveyData()
				// measure time at this point:
				lastTimeMeasured = new Date().getTime(); // in milliseconds
			};

			// Assert function
			function assert(condition, message) {
				if (!condition) {
					message = message || "Assertion failed";
					if (typeof Error !== "undefined") {
						throw new Error(message);
					}
					throw message; // Fallback
				}
			}

			function median(values) { // TODO: replace code by '50th percentile' - should be the same?
				values.sort( function(a,b) {return a - b;} );
				var half = Math.floor(values.length/2);
				if(values.length % 2)
				return values[half];
				else
				return (values[half-1] + values[half]) / 2.0;
			}

			function percentile(values, n) {
				values.sort( function(a,b) {return a - b;} );
				// get ordinal rank
				var rank = Math.min(Math.floor(values.length*n/100), values.length-1);
				return values[rank];
			}

			/***********************
			*	TIME MEASUREMENT  *
			************************/

			// measure time since last time this function was called
			function timeSinceLastCall() {
				// current time
				var currentTime = new Date().getTime();
				// calculate time difference
				var timeDifference = currentTime - lastTimeMeasured + timeInBuffer;
				// clear buffer (for pausing)
				timeInBuffer = 0;
				// remember last measured time
				lastTimeMeasured = currentTime;
				return timeDifference;
			}

			// pause time measurement
			function pauseTimeMeasurement() {
				// UN-PAUSE
				if (measurementPaused) { // already paused
					// button shows 'pause' again
					document.getElementById('pauseButton').innerHTML = 'Pause';
					// toggle state
					measurementPaused = false;
					// resume time measurement
					lastTimeMeasured = new Date().getTime(); // reset time, discard time while paused
				} else { // PAUSE
					// button shows 'resume'
					document.getElementById('pauseButton').innerHTML = 'Resume';
					// toggle state
					measurementPaused = true;
					// pause time measurement
					timeInBuffer = timeSinceLastCall();
				}
			}

			// show elapsed time on interface
			function showTimeElapsedInSeconds() {
				// if paused: un-pause
				if (measurementPaused) {
					pauseTimeMeasurement();
				}

				// time of last annotation
				var lastAnnotationTime = timeSinceLastCall()/1000;
				document.getElementById('timeDisplay').innerHTML = lastAnnotationTime.toFixed(2);
				// average time over last ... annotations
				var avgAnnotationTime;
				var numberOfElementsToAverage =
						document.getElementById('numberOfTimeAverages').value;
				if (isPositiveInteger(numberOfElementsToAverage)) {
					avgAnnotationTime =
						calculateAverageTime(lastAnnotationTime,
											 Number(numberOfElementsToAverage));
				} else {
					// change text field content to 'ALL'
					document.getElementById('numberOfTimeAverages').value = 'ALL';
					avgAnnotationTime = calculateAverageTime(lastAnnotationTime, -1);
				}
				document.getElementById('timeAverageDisplay').innerHTML = avgAnnotationTime.toFixed(2);
			}

			// auxiliary function: is string a positive integer?
			// http://stackoverflow.com/questions/10834796/...
			// validate-that-a-string-is-a-positive-integer
			function isPositiveInteger(str) {
				var n = ~~Number(str);
				return String(n) === str && n >= 0;
			}

			// calculate average time
			function calculateAverageTime(newTimeMeasurementInSeconds,numberOfPoints) {
				// append last measurement time to time array, if significant
				if (newTimeMeasurementInSeconds > MIN_TIME) {
					timeArray.push(newTimeMeasurementInSeconds);
				}
				// average over last N elements of this array
				if (numberOfPoints < 0 || numberOfPoints>=timeArray.length) { // calculate average over all
					var sum = 0;
					for (var i = 0; i < timeArray.length; i++) {
						sum += timeArray[i];
					}
					averageOfTimes = sum/timeArray.length;
				} else { // calculate average over specified number of times measured last
					var sum = 0;
					for (var i = timeArray.length-numberOfPoints; i < timeArray.length; i++) {
						sum += timeArray[i];
					}
					averageOfTimes = sum/numberOfPoints;
				}
				return averageOfTimes;
			}


			/********************************
			*	   PLAYBACK OF AUDIO	   *
			********************************/

			//PLAYaudioelement
			// Keep track of whether audio should be played
			function playFlagChanged(){
				playAudio = playFlag.checked; // global variable

				if (!playAudio){ // if audio needs to stop
					audio.pause(); // stop audio - if anything is playing
					currently_playing = ''; // back to empty string so playaudioelement knows nothing's playing
				}
			}

			// audioholder that's currently playing
			var currently_playing_audioholder = ''; // at first: empty string
			var currently_playing_audioelement  = '';
			var audio;

			// Play audioelement of audioholder if available, from start or from same position
			function playaudioelement(audioholderName, audioelementerName){
				if (playAudio) { // if enabled
					// get corresponding file from folder
					var file_location = 'audio/'+audioholderName + '/' + audioelementerName + '.mp3'; // fixed path and file name format

					// if not available, show error/warning message
					//TODO ...

					// if nothing playing yet, start playing
					if (currently_playing_audioholder == ''){ // signal that nothing is playing
						//playSound(audioBuffer);
						audio = new Audio(file_location);
						audio.loop = true; // loop when end is reached
						audio.play();
						currently_playing_audioholder = audioholderName;
						currently_playing_audioelement  = audioelementerName;
					} else if (currently_playing_audioholder != audioholderName) {
					// if different audioholder playing, stop that and start playing
						audio.pause(); // stop audio
						audio = new Audio(file_location); // load new file
						audio.loop = true; // loop when end is reached
						audio.play(); // play audio from the start
						currently_playing_audioholder = audioholderName;
						currently_playing_audioelement  = audioelementerName;
					} else if (currently_playing_audioelement != audioelementerName) {
					// if same audioholder playing, start playing from where it left off
						skipTime = audio.currentTime; // time to skip to
						audio.pause(); // stop audio
						audio = new Audio(file_location);
						audio.addEventListener('loadedmetadata', function() {
							this.currentTime = skipTime;
							console.log('Loaded '+audioholderName+'-'+audioelementerName+', playing from '+skipTime);
						}, false); // skip to same time when audio is loaded!
						audio.loop = true; // loop when end is reached
						audio.play(); // play from that time
						audio.currentTime = skipTime;
						currently_playing_audioholder = audioholderName;
						currently_playing_audioelement  = audioelementerName;
					}
					// if same audioelement playing: keep on playing (i.e. do nothing)
				}
			}

			/********************
			*	READING FILES  *
			********************/

			// Read necessary data from XML file
			function readXML(xmlFileName){
				if (window.XMLHttpRequest)
				  {// code for IE7+, Firefox, Chrome, Opera, Safari
				  xmlhttp=new XMLHttpRequest();
				  }
				else
				  {// code for IE6, IE5
				  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
				  }
				xmlhttp.open("GET",xmlFileName,false);
				xmlhttp.send();
				return xmlhttp.responseXML;
			}

			// go over all files and compute relevant statistics
			function loadAllFiles() {
				// retrieve information from XMLs

				for (fileIndex = 0; fileIndex < xmlFiles.length; fileIndex++) {
					xmlFileName = xmlFileFolder+"/"+xmlFiles[fileIndex];
					xml = readXML(xmlFileName);
					if (xml != null) { // if file exists
						// append file name to array of file names
						fileNameArray.push(xmlFiles[fileIndex]);

						// get root of XML file
						root = xml.getElementsByTagName('browserevaluationresult')[0];

						// get subject ID, add to array if not already there
						pretest = root.getElementsByTagName('pretest')[0];
						subjectID = pretest.getElementsByTagName('comment')[0];
						if (subjectID){
							if (subjectID.getAttribute('id')!='sessionId') { // warning in console when not available
								console.log(xmlFiles[fileIndex]+': no SessionID available');
							}
							if (subjectArray.indexOf(subjectID.textContent) == -1) { // if not already in array
								subjectArray.push(subjectID.textContent); // append to array
							}
						}

						// go over all audioholders, add to array if not already there
						audioholderNodes = root.getElementsByTagName('audioholder');
						// go over audioholderNodes and append audioholder name when not present yet
						for (audioholderIndex = 0; audioholderIndex < audioholderNodes.length; audioholderIndex++) {
							audioholderName = audioholderNodes[audioholderIndex].getAttribute('id');
							if (audioholderArray.indexOf(audioholderName) == -1) { // if not already in array
								audioholderArray.push(audioholderName); // append to array
							}
							// within each audioholder, go over all audioelement IDs, add to array if not already there
							audioelementNodes = audioholderNodes[audioholderIndex].getElementsByTagName('audioelement');
							for (audioelementIndex = 0; audioelementIndex < audioelementNodes.length; audioelementIndex++) {
								audioelementName = audioelementNodes[audioelementIndex].getAttribute('id');
								if (audioelementArray.indexOf(audioelementName) == -1) { // if not already in array
									audioelementArray.push(audioelementName); // append to array
								}
							}
						}
						// count occurrences of each audioholder
						// ...
					}
					else {
						console.log('XML file '+xmlFileName+' not found.');
					}
				}

				// sort alphabetically
				fileNameArray.sort();
				subjectArray.sort();
				audioholderArray.sort();
				audioelementArray.sort();

				// display all information in HTML
				// show XML file folder
				document.getElementById('xmlFileFolder_span').innerHTML = "\""+xmlFileFolder+"/\"";
				// show number of files
				document.getElementById('numberOfFiles_span').innerHTML = fileNameArray.length;
				// show list of subject names
				document.getElementById('subjectArray_span').innerHTML = subjectArray.toString();
				// show list of audioholders
				document.getElementById('audioholderArray_span').innerHTML = audioholderArray.toString();
				// show list of audioelementes
				document.getElementById('audioelementArray_span').innerHTML = audioelementArray.toString();
			}

			function printSurveyData() {
				// print some fields from the survey for different people

				// go over all XML files
				for (fileIndex = 0; fileIndex < xmlFiles.length; fileIndex++) {
					xmlFileName = xmlFileFolder+"/"+xmlFiles[fileIndex];
					xml = readXML(xmlFileName);
					// make a div
					var div = document.createElement('div');
					document.body.appendChild(div);
					div.id = 'div_survey_'+xmlFileName;
					div.style.width = '1100px';
					//div.style.height = '350px';

					// title for that div (subject id)
					document.getElementById('div_survey_'+xmlFileName).innerHTML = '<h2>'+xmlFileName+'</h2>';

					// which songs did they do
					if (xml != null) { // if file exists
						// get root of XML file
						root = xml.getElementsByTagName('browserevaluationresult')[0];
						// go over all audioholders
						// document.getElementById('div_survey_'+xmlFileName).innerHTML += '<strong>Audioholders: </strong>';
						// audioholderNodes = root.getElementsByTagName('audioholder');
						// for (audioholderIndex = 0; audioholderIndex < audioholderNodes.length-1; audioholderIndex++) {
						// 	document.getElementById('div_survey_'+xmlFileName).innerHTML += audioholderNodes[audioholderIndex].getAttribute('id')+', ';
						// }
						// document.getElementById('div_survey_'+xmlFileName).innerHTML += audioholderNodes[audioholderNodes.length-1].getAttribute('id');

						// survey responses (each if available)
						// get posttest node for total test
						childNodes = root.childNodes;
						posttestnode = null;
						for (idx = 0; idx < childNodes.length; idx++){
							if (childNodes[childNodes.length-idx-1].tagName == 'posttest') {
								posttestnode = childNodes[childNodes.length-idx-1];
								break;
							}
						}

						// post-test info
						if (posttestnode) {
							posttestcomments = posttestnode.getElementsByTagName('comment');
							for (idx=0; idx < posttestcomments.length; idx++){
								commentsToPrint = ['age', 'location']; // CHANGE WHAT TO PRINT
								idAttribute = posttestcomments[idx].getAttribute('id');
								if (commentsToPrint.indexOf(idAttribute) >= 0) { // if exists?
									document.getElementById('div_survey_'+xmlFileName).innerHTML += '<br><strong>'+idAttribute+': </strong>'+posttestcomments[idx].textContent;
								}
							}
						}
					}
				}
			}

			function makePlots() { //TODO: split into different functions
				// TEMPORARY
				makeTimeline(xmlFileFolder+"/"+xmlFiles[7]);

				// create value array
				var ratings = [];  // 3D matrix of ratings (audioholder, audioelement, subject)
				for (audioholderIndex = 0; audioholderIndex < audioholderArray.length; audioholderIndex++) {
					ratings.push([]);
					for (audioelementIndex = 0; audioelementIndex < audioelementArray.length; audioelementIndex++) {
						ratings[audioholderIndex].push([]);
					}
				}

				// go over all XML files
				for (fileIndex = 0; fileIndex < xmlFiles.length; fileIndex++) {
					xmlFileName = xmlFileFolder+"/"+xmlFiles[fileIndex];
					xml = readXML(xmlFileName);
					if (xml != null) { // if file exists
						// get root of XML file
						root = xml.getElementsByTagName('browserevaluationresult')[0];
						// go over all audioholders
						audioholderNodes = root.getElementsByTagName('audioholder');
						for (audioholderIndex = 0; audioholderIndex < audioholderNodes.length; audioholderIndex++) {
							audioholderName = audioholderNodes[audioholderIndex].getAttribute('id');
							audioelementNodes = audioholderNodes[audioholderIndex].getElementsByTagName('audioelement');
							// go over all audioelements
							for (audioelementIndex = 0; audioelementIndex < audioelementNodes.length; audioelementIndex++) {
								audioelementName = audioelementNodes[audioelementIndex].getAttribute('id');
								// get value
								var value = audioelementNodes[audioelementIndex].getElementsByTagName("value")[0].textContent;
								if (value) { // if not empty, null, undefined...
									ratingValue = parseFloat(value);
									// add to matrix at proper position
									aHidx = audioholderArray.indexOf(audioholderName);
									aEidx = audioelementArray.indexOf(audioelementName);
									ratings[aHidx][aEidx].push(ratingValue);
								}
							}
						}

						// go over all audioholders

						// go over all audioelements within audioholder, see if present in idMatrix, add if not
						// add corresponding rating to 'ratings', at position corresponding with position in idMatrix
					}
				}

				for (audioholderIndex = 0; audioholderIndex < audioholderArray.length; audioholderIndex++) {
					audioholderName = audioholderArray[audioholderIndex]; // for this song
					tickArray = []

					raw_data = [['SubjectID', 'Rating']];
					audioElIdx = 0;
					for (audioelementIndex = 0; audioelementIndex<ratings[audioholderIndex].length; audioelementIndex++){
						if (ratings[audioholderIndex][audioelementIndex].length>0) {
							audioElIdx++; // increase if not empty
							// make tick label
							tickArray.push({v:audioElIdx, f: audioelementArray[audioelementIndex]});
						}
						for (subject = 0; subject<ratings[audioholderIndex][audioelementIndex].length; subject++){
							// add subject-value pair for each subject
							raw_data.push([audioElIdx, ratings[audioholderIndex][audioelementIndex][subject]]);
						}
					}

					// create plot (one per song)
					var data = google.visualization.arrayToDataTable(raw_data);

					var options = {
						title: audioholderName,
						hAxis: {title: 'audioelement ID', minValue: 0, maxValue: audioElIdx+1,
								ticks: tickArray},
						vAxis: {title: 'Rating', minValue: 0, maxValue: 1},
						seriesType: 'scatter',
						legend: 'none'
					};
					var div = document.createElement('div');
					document.body.appendChild(div);
					div.id = 'div_'+audioholderName;
					div.style.width = '1100px';
					div.style.height = '350px';
					var chart = new google.visualization.ComboChart(document.getElementById('div_'+audioholderName));
					chart.draw(data, options);

					// box plots
					var div = document.createElement('div');
					document.body.appendChild(div);
					div.id = 'div_box_'+audioholderName;
					div.style.width = '1100px';
					div.style.height = '350px';
					// Get median, percentiles, maximum and minimum; outliers.
					pctl25 = [];
					pctl75 = [];
					med = [];
					min = [];
					max = [];
					outlierArray = [];
					max_n_outliers = 0; // maximum number of outliers for one audioelement
					for (audioelementIndex = 0; audioelementIndex<ratings[audioholderIndex].length; audioelementIndex++){
						med.push(median(ratings[audioholderIndex][audioelementIndex])); // median
						pctl25.push(percentile(ratings[audioholderIndex][audioelementIndex], 25)); // 25th percentile
						pctl75.push(percentile(ratings[audioholderIndex][audioelementIndex], 75)); // 75th percentile
						IQR = pctl75[pctl75.length-1]-pctl25[pctl25.length-1];
						// outliers: range of values which is above pctl75+1.5*IQR or below pctl25-1.5*IQR
						outliers = [];
						rest = [];
						for (idx = 0; idx<ratings[audioholderIndex][audioelementIndex].length; idx++){
							if (ratings[audioholderIndex][audioelementIndex][idx] > pctl75[pctl75.length-1]+1.5*IQR ||
								ratings[audioholderIndex][audioelementIndex][idx] < pctl25[pctl25.length-1]-1.5*IQR){
								outliers.push(ratings[audioholderIndex][audioelementIndex][idx]);
							}
							else {
								rest.push(ratings[audioholderIndex][audioelementIndex][idx]);
							}
						}
						outlierArray.push(outliers);
						max_n_outliers = Math.max(max_n_outliers, outliers.length); // update max mber
						// max: maximum value which is not outlier
						max.push(Math.max.apply(null, rest));
						// min: minimum value which is not outlier
						min.push(Math.min.apply(null, rest));
					}

					// Build data array
					boxplot_data = [['ID', 'Span', '', '', '', 'Median']];
					for (idx = 0; idx < max_n_outliers; idx++) {
						boxplot_data[0].push('Outlier');
					}
					for (audioelementIndex = 0; audioelementIndex<ratings[audioholderIndex].length; audioelementIndex++){
						if (ratings[audioholderIndex][audioelementIndex].length>0) { // if rating array not empty for this audioelement
							data_array = [
									audioelementArray[audioelementIndex], // name
									min[audioelementIndex], // minimum
									pctl75[audioelementIndex],
									pctl25[audioelementIndex],
									max[audioelementIndex], // maximum
									med[audioelementIndex]
									];
							for (idx = 0; idx < max_n_outliers; idx++) {
								if (idx<outlierArray[audioelementIndex].length){
									data_array.push(outlierArray[audioelementIndex][idx]);
								}
								else {
									data_array.push(null);
								}
							}
							boxplot_data.push(data_array);
						}
					}

					// Create and populate the data table.
					var data = google.visualization.arrayToDataTable(boxplot_data);
					  // Create and draw the visualization.
					var ac = new google.visualization.ComboChart(document.getElementById('div_box_'+audioholderName));
					ac.draw(data, {
						title : audioholderName,
						//width: 600,
						//height: 400,
						vAxis: {title: "Rating"},
						hAxis: {title: "audioelement ID"},
						seriesType: "line",
						pointSize: 5,
						lineWidth: 0,
						colors: ['black'],
						series: { 0: {type: "candlesticks", color: 'blue'}, // box plot shape
								  1: {type: "line", pointSize: 10, lineWidth: 0, color: 'red' } }, // median
						legend: 'none'
					});
				}
			}

			function makeTimeline(xmlFileName){ // WIP
				// Based on the XML file name, take time data and plot playback and marker movements

				// read XML file and check if exists
				xml = readXML(xmlFileName);
				if (!xml) { // if file does not exist
					console.log('XML file '+xml+'does not exist. ('+xmlFileName+')')
					return; // do nothing; exit function
				}
				// get root of XML file
				root = xml.getElementsByTagName('browserevaluationresult')[0];

				audioholder_time = 0;
				previous_audioholder_time = 0; // time spent before current audioholder
				time_offset = 0; // test starts at zero

				// go over all audioholders
				audioholderNodes = root.getElementsByTagName('audioholder');
				for (audioholderIndex = 0; audioholderIndex < audioholderNodes.length; audioholderIndex++) {
					audioholderName = audioholderNodes[audioholderIndex].getAttribute('id');
					if (!audioholderName) {
						console.log('audioholder name is empty; go to next one. ('+xmlFileName+')');
						break;
					}

					// subtract total audioholder length from subsequent audioholder event times
					audioholder_children = audioholderNodes[audioholderIndex].childNodes;
					foundIt = false;
					console.log(audioholder_children[2].getElementsByTagName("metricResult")) // not working!
					for (idx = 0; idx<audioholder_children.length; idx++) { // go over children

						if (audioholder_children[idx].getElementsByTagName('metricResult').length) {
							console.log(audioholder_children[idx].getElementsByTagName('metricResult')[0]);
							if (audioholder_children[idx].getElementsByTagName('metricResult')[0].getAttribute('id') == "testTime"){
								audioholder_time = parseFloat(audioholder_children[idx].getElementsByTagName('metricResult')[0].textContent);
								console.log(audioholder_time);
								foundIt = true;
							}
						}
					}
					if (!foundIt) {
						console.log("Skipping audioholder without total time specified from "+xmlFileName+"."); // always hitting this
						break;
					}

					audioelementNodes = audioholderNodes[audioholderIndex].getElementsByTagName('audioelement');

					// make div

					// draw chart

					// legend with audioelement names
				}
			}

		</script>


		<style>
			div {
				padding: 2px;
				margin-top: 2px;
				margin-bottom: 2px;
			}
			div.head{
				margin-left: 10px;
				border: black;
				border-width: 2px;
				border-style: solid;
			}
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  				margin-bottom: 5px;
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		</style>

	</head>

	<body>
		<h1>Subjective evaluation results</h1>

		<div id="debugDisplay">
		XML file folder: <span id="xmlFileFolder_span"></span>
		</div>

		<div id="headerMatter">
			<div>
				<strong>Result XML files:</strong> <span id="numberOfFiles_span"></span>
			</div>
			<div>
				<strong>Audioholders in dataset:</strong> <span id="audioholderArray_span"></span>
			</div>
			<div>
				<strong>Subjects in dataset:</strong> <span id="subjectArray_span"></span>
			</div>
			<div>
				<strong>Audioelements in dataset:</strong> <span id="audioelementArray_span"></span>
			</div>
			<br>
		</div>
		<br>

		<!-- Show time elapsed
		The last annotation took <strong><span id="timeDisplay">(N/A)</span></strong> seconds.
		<br>-->

	</body>
</html>
author	Nicholas Jillings <n.g.r.jillings@se14.qmul.ac.uk>
date	Fri, 29 Jan 2016 11:11:57 +0000
parents
children	b5bf2f57187c 9ee921c8cdd3 eef2d4ea18fb