%%% EX 11 - CSP
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-25pt: not understandable how constraints have been validated.
-25pt: wrong solution.

%%% EX 12 - AlphaBeta Pruning
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-20pt: missed pruning on the right branch.

%%% EX 13 - A*
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Correct.

%%% EX 14 - Planning
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Correct.

%%% EX 15 - LRTA
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Wrong.