countable sets
(slang) To stimulate one's vulva against another vulva; to scissor.
(zoology) Any therocephalian therapsid in the obsolete family Scaloposauridae.
plural of countable set
A puffball (Lycoperdon giganteum).
位相空間の授業で、可算集合が特定の部分空間で稠密になり得ることを証明しました。
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