Artificial intelligence
Which kind of planning consists of successive representations of different levels of a plan?

project planning
hierarchical planning
non-hierarchical planning
all of the mentioned

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Artificial intelligence
An algorithm A is admissible if ___________

It returns more solutions, but not an optimal one
It guarantees to return more optimal solutions
It is guaranteed to return an optimal solution when one exists
It is not guaranteed to return an optimal solution when one exists

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