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Например Борис должно вывести Бор.
Size: a a a
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=ARRAYFORMULA(join("",if(REGEXMATCH(MID(H10,COLUMN(A2:D2),1),"О|о|А|а|И|и|Э|э|Е|е|У|у|Я|я|І|і"),1,0)))NK
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"=mid($K$1;1;QUERY({ARRAYFORMULA({arrayformula(REGEXMATCH({MID($K$1;row(INDIRECT(""a1:a""&len($K$1)));1)};""[А|а|У|у|Е|е|О|о|Ы|ы|Э|э|Я|я|И|и|Ю|ю]""))*{false();arrayformula( not(REGEXMATCH({MID($K$1;row(INDIRECT(""a1:a""&len($K$1)-1));1)};""[А|а|У|у|Е|е|О|о|Ы|ы|Э|э|Я|я|И|и|Ю|ю]"")))}})\arrayformula({row(INDIRECT(""a1:a""&len($K$1)))})};""select Col2 where Col1=1 limit 1 "")-1)&""."""NK