Daniel@0: digraph G {
Daniel@0:   // leave some space for the head/taillabels
Daniel@0:   graph [ranksep=1.5 splines=true overlap=false]
Daniel@0: 
Daniel@0:   // to avoid confusion, remember this:
Daniel@0:   // it's spelt tail/head, but it's read start/end
Daniel@0: 
Daniel@0:   // emphasize theatrically
Daniel@0:   // show only explicitly given head/tails
Daniel@0:   // put head/tail labels farther from the node
Daniel@0: //  edge [arrowsize=2 dir=none labeldistance=3]
Daniel@0:   edge [dir=none labeldistance=3]
Daniel@0: 
Daniel@0:   // not interested in node labels
Daniel@0:   node [shape=circle width=0.5 label=""]
Daniel@0: 
Daniel@0:   {
Daniel@0:     edge [samehead=ahead samearrowhead=1]
Daniel@0:     a->Z [arrowtail=none taillabel=none]
Daniel@0:     b->Z [arrowtail=normal taillabel=normal]
Daniel@0:     c->Z [arrowtail=inv taillabel=inv]
Daniel@0:     d->Z [arrowtail=dot taillabel=dot]
Daniel@0:     e->Z [arrowtail=odot taillabel=odot]
Daniel@0:     f->Z [arrowtail=invdot taillabel=invdot]
Daniel@0:     g->Z [arrowtail=invodot taillabel=invodot]
Daniel@0:     h->Z [arrowtail=open taillabel=open]
Daniel@0:     i->Z [arrowtail=halfopen taillabel=halfopen arrowhead=inv headlabel=samehead]
Daniel@0:     j->Z [arrowtail=empty taillabel=empty]
Daniel@0:     k->Z [arrowtail=invempty taillabel=invempty]
Daniel@0:     l->Z [arrowtail=diamond taillabel=diamond]
Daniel@0:     m->Z [arrowtail=odiamond taillabel=odiamond]
Daniel@0:     n->Z [arrowtail=box taillabel=box]
Daniel@0:     o->Z [arrowtail=obox taillabel=obox]
Daniel@0:     p->Z [arrowtail=tee taillabel=tee]
Daniel@0:     q->Z [arrowtail=crow taillabel=crow]
Daniel@0:   }
Daniel@0:   {
Daniel@0:     edge [sametail=atail samearrowtail=1]
Daniel@0:     Z->A [arrowhead=none headlabel=none]
Daniel@0:     Z->B [arrowhead=normal headlabel=normal]
Daniel@0:     Z->C [arrowhead=inv headlabel=inv]
Daniel@0:     Z->D [arrowhead=dot headlabel=dot]
Daniel@0:     Z->E [arrowhead=odot headlabel=odot]
Daniel@0:     Z->F [arrowhead=invdot headlabel=invdot]
Daniel@0:     Z->G [arrowhead=invodot headlabel=invodot]
Daniel@0:     Z->H [arrowhead=open headlabel=open]
Daniel@0:     Z->I [arrowhead=halfopen headlabel=halfopen arrowtail=inv taillabel=sametail]
Daniel@0:     Z->J [arrowhead=empty headlabel=empty]
Daniel@0:     Z->K [arrowhead=invempty headlabel=invempty]
Daniel@0:     Z->L [arrowhead=diamond headlabel=diamond]
Daniel@0:     Z->M [arrowhead=odiamond headlabel=odiamond]
Daniel@0:     Z->N [arrowhead=box headlabel=box]
Daniel@0:     Z->O [arrowhead=obox headlabel=obox]
Daniel@0:     Z->P [arrowhead=tee headlabel=tee]
Daniel@0:     Z->Q [arrowhead=crow headlabel=crow]
Daniel@0:   }
Daniel@0: }