The Spelling Rule (8-7-5)

8	7	5
After the following consonants: ж ш щ ч к г х ц	я --> а ю --> у	After the following consonants: ж ш щ ч к г х	ы --> и	After the following consonants: ж ш щ ч ц	in endings: stressed о --> stressed о unstressed о --> unstressed е

After the following consonants:

я --> а

ю --> у

After the following consonants:

ы --> и

After the following consonants:

in endings:

stressed о -->
stressed о

unstressed о --> unstressed е