Collective numerals (two, six) differ from other numerals (two, five) in that they denote the number of objects as a whole. The word both (both) also applies to collective numbers. Collective numbers are used only with the names of masculine persons: three cats (but three cats). They are simple in structure, they are not part of the fractional ones, they have a suf. -o / oj, -ep and have no category.
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