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overlapsSpatially comparison table
Subject documentation have axiom
unparented  
overlapsSpatially(overlapsSpatially ?OBJ1 ?OBJ2) means that the Objects ?OBJ1 and ?OBJ2 have some parts in common. This is a reflexive and symmetric (but not transitive) relation
(=>
(meetsSpatially ?OBJ1 ?OBJ2)
(not
(overlapsSpatially ?OBJ1 ?OBJ2)))

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