feminine nouns always have their accusative different from genitive or nominative in singular (almost always, some nouns have Acc=Nom but their adjectives have different forms ex małA mysz, małĄ mysz), and accusative=nominative in plural. Neuter nouns have accusative=genitive always. But Masculine divides into three subgenders
- personal always accusative = genitive, plural is masculine personal verbs and adjectives
animate not personal , singular accusative= genitive, plural is not masculine personal verbs and adjectives, plural accusative=nominative
not animated , all accusative=nominative, plural is not masculine personal verbs and adjectives
I meant that plural adjectives and verbs (in the past) have two forms - masculine personal , and not masculine personal. So masculine animals and objects, with women and children and all neuter and feminine nouns create one "gender" not animate personal, or wiktionary calls it "other"