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1 digraph G {
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2 // leave some space for the head/taillabels
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3 graph [ranksep=1.5 splines=true overlap=false]
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4
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5 // to avoid confusion, remember this:
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6 // it's spelt tail/head, but it's read start/end
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7
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8 // emphasize theatrically
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9 // show only explicitly given head/tails
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10 // put head/tail labels farther from the node
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11 // edge [arrowsize=2 dir=none labeldistance=3]
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12 edge [dir=none labeldistance=3]
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13
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14 // not interested in node labels
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15 node [shape=circle width=0.5 label=""]
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16
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17 {
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18 edge [samehead=ahead samearrowhead=1]
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19 a->Z [arrowtail=none taillabel=none]
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20 b->Z [arrowtail=normal taillabel=normal]
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21 c->Z [arrowtail=inv taillabel=inv]
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22 d->Z [arrowtail=dot taillabel=dot]
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23 e->Z [arrowtail=odot taillabel=odot]
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24 f->Z [arrowtail=invdot taillabel=invdot]
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25 g->Z [arrowtail=invodot taillabel=invodot]
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26 h->Z [arrowtail=open taillabel=open]
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27 i->Z [arrowtail=halfopen taillabel=halfopen arrowhead=inv headlabel=samehead]
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28 j->Z [arrowtail=empty taillabel=empty]
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29 k->Z [arrowtail=invempty taillabel=invempty]
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30 l->Z [arrowtail=diamond taillabel=diamond]
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31 m->Z [arrowtail=odiamond taillabel=odiamond]
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32 n->Z [arrowtail=box taillabel=box]
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33 o->Z [arrowtail=obox taillabel=obox]
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34 p->Z [arrowtail=tee taillabel=tee]
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35 q->Z [arrowtail=crow taillabel=crow]
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36 }
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37 {
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38 edge [sametail=atail samearrowtail=1]
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39 Z->A [arrowhead=none headlabel=none]
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40 Z->B [arrowhead=normal headlabel=normal]
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41 Z->C [arrowhead=inv headlabel=inv]
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42 Z->D [arrowhead=dot headlabel=dot]
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43 Z->E [arrowhead=odot headlabel=odot]
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44 Z->F [arrowhead=invdot headlabel=invdot]
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45 Z->G [arrowhead=invodot headlabel=invodot]
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46 Z->H [arrowhead=open headlabel=open]
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47 Z->I [arrowhead=halfopen headlabel=halfopen arrowtail=inv taillabel=sametail]
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48 Z->J [arrowhead=empty headlabel=empty]
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49 Z->K [arrowhead=invempty headlabel=invempty]
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50 Z->L [arrowhead=diamond headlabel=diamond]
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51 Z->M [arrowhead=odiamond headlabel=odiamond]
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52 Z->N [arrowhead=box headlabel=box]
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53 Z->O [arrowhead=obox headlabel=obox]
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54 Z->P [arrowhead=tee headlabel=tee]
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55 Z->Q [arrowhead=crow headlabel=crow]
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56 }
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57 }
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