inclusion.member(2, hset(c(2,3)))
2 %in% hset(c(2,3))
inclusion.member(1, hset(c(2,3))) # 1 %in% hset(c(2,3))
inclusion.member(2, hset(c(2,3), generalized = TRUE))
inclusion.member(2, hset(c(2,3), c(.5, 1))) # default multiplicity is 1
inclusion.member(2, hset(c(2,3), c(.5, 1)), .5)
inclusion.member(2, hset(c(2,3), c(.5, 1)), .5, `<`) # strict inclusion
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