https://russian.stackexchange.com/questions/11304/%D0%93%D0%BB%D0%B0%D1%81%D0%BD%D1%8B%D0%B5-%D0%BF%D0%BE%D1%81%D0%BB%D0%B5-%D0%BA-%D0%B3-%D1%85-%D0%B6-%D1%88-%D1%87-%D1%89
Dec 4, 2015 · I am new to Russian language. What гласные are not allowed after к, г, х and ж, ш, ч, щ? And what гласные are allowed in this case?