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entity
physical
abstract
quantity
attribute
set or class
relation
single valued relation
total valued relation
partial valued relation
binary relation
probability relation
spatial relation
front fn
back fn
part
partly located
between
traverses
where fn
distance
larger
smaller
connected
connects
mereological sum fn
mereological product fn
mereological difference fn
hole
principal host fn
partially fills
skin fn
orientation
temporal relation
ternary relation
quaternary relation
quintary relation
list
predicate
variable arity relation
relation extended to quantities
proposition
graph
graph element