MST-LB-SEARCH : WFFOPMST-LB-SEARCH is a wff operation.
Least Branching Search: In each leaf node, take the current
obligation and find a literal that can be mated, but with as few
mates as possible. Add all of these mates as sons to this node.
Repeat until a closed leaf is generated.
This search is probably not complete.
The calling scheme for MST-LB-SEARCH is:
The result is of type OBLIGATION.
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