?? fig11_8.pl
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% Figure 11.8 A depth-limited, depth-first search program.
% depthfirst2( Node, Solution, Maxdepth):
% Solution is a path, not longer than Maxdepth, from Node to a goal
depthfirst2( Node, [Node], _) :-
goal( Node).
depthfirst2( Node, [Node | Sol], Maxdepth) :-
Maxdepth > 0,
s( Node, Node1),
Max1 is Maxdepth - 1,
depthfirst2( Node1, Sol, Max1).
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