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whitespace	add node and connect with previous node, if any, by a successor edge
>	connect node with previous by a successor edge
<	connect node with previous by a reverse successor edge
↔	connect node with previous by successor edges in both directions
—	connect node with previous by a successor edge if there does not yet exist such an edge in either direction
+>, <+, <+>, -+-	as before, but branch instead of successor edges
/>, </, </>, -/-	as before, but refinement instead of successor edges
-e→, ←e-, ←e→, -e- with an int-valued expression e	as before, but edges of type e instead of successor edges	-n→ with a node-valued expression n	create a compound edge with n encoding the edge data
←n- with a node-valued expression n	as before, but reverse direction