- 7-letter spelling rule:
- After г, к, х, and ж, ч, ш, щ —
never write ы, instead use и.
- 5-letter spelling rule:
- After ж, ч, ш, щ, and ц —
never write an unstressed о, instead use е.
- 8-letter spelling rule:
- After ж, ч, ш, щ, ц, and г, к, х, —
never write я or ю, instead use а and у.