_:b254664538 . _:b254664538 . _:b254664538 "A caterpillar walking on the surface of a leaf is adjacent_to the leaf, if one of the caterpillar appendages is touching the leaf. In contrast, a butterfly flying close to a flower is not considered adjacent, unless there are any touching parts." . _:b254664538 . _:b254664538 . _:b254664538 . _:b254664538 .