Genetive Plural (gen.pl.)
Same as in gen.sg. but now for plural, and for numbers above 5.
Do note that there are a lot of special cases, which the book recommends to just memorize the words and not try to learn the specific rules.
Feminine nouns ending in -а and neuter nouns in -о just drop the ending
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книга (book) becomes книг (of books)
слово (word) becomes слов (of words)
If they end in ь (soft sign), or in any of ж, ч, ш, щ, й, then you will append a -ей (dropping the soft sign in that specific case.)
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например рубль becomes рублей
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врач becomes врачей
All nouns ending in ие and ия, will do the typical change to -ий
Most masculine nouns that end in consonant will have -ов added to the word
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язык becomes языков