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SHLOMIF / Graph-Easy-0.72 / t / in / 7_tree.txt 
edge { start: south, 0; } 

 [ A ]
 [ A ] -> [ A1 ] { origin: A; offset: 2,1; }
 [ A ] -> [ A2 ]
 [ A ] -> [ A3 ]

 [ A2 ] -> [ A23 ] { origin: A2; offset: 2,1 }
 [ A2 ] -> [ A22 ]
 [ A2 ] -> [ A21 ]