Table 1.

Edge transitions and corresponding move operations.

	→	⊣	←	⊢	∅
→	-	st	rev	rst	del
⊣	st	-	rst	rev	del
←	rev	rst	-	st	del
⊢	rst	rev	st	-	del
∅	addA	addI	addA	addI	-

Possible edge transitions and the corresponding move to perform the transition. An edge is changed from the type shown in the first column to the type shown in the first row by the move shown in the corresponding table field. The following moves are possible: addA: Add activation, addI: Add inhibition, del: delete, rev: revert, st: switch type, rst: revert and switch type. The symbols for the edges are →: activation, ⊣: inhibition, ∅: no edge.