| type | Concrete Class | 
| Name | has | 
| Description | has(Whole, Component), has(Whole, Component) <- instance_of(Whole, Whole_class) ^ instance_of(Component, Component_class), e.g. has(Mother_boardX, SlotX) <- instance_of(Mother_boardX, mother_board) ^ instance_of(SlotX, slot). This is the most general type of part_of relation. | 
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