oneThis plural form is used for numbers like: n mod 10 is 1 and n mod 100 is not 11
год
fewThis plural form is used for numbers like: n mod 10 in 2..4 and n mod 100 not in 12..14
года
manyThis plural form is used for numbers like: n mod 10 is 0 or n mod 10 in 5..9 or n mod 100 in 11..14
otherThis plural form is used for numbers like: everything else
лет
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