owner d: an agent, where
d is a cell or an
indirection. The agent where it is located.
OBS:This data is not implemented by the action interpreter.
d [on d1]: a subsort of cell, where
d1 is a (sort of) agent, and d is a sort of cell.
It includes only those cells in d whose owner is (of sort) d1. Similarly when
d is a (sort of) indirection.
OBS:This data is not implemented by the action interpreter.
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