in English is:

codification

Mutations

Soft:godeiddiad
Nasal:nghodeiddiad
Aspirate:chodeiddiad

Use

y codeiddiad hwn
fy nghodeiddiad i
dy godeiddiad di
ei godeiddiad ef/o
ei chodeiddiad hi
ein codeiddiad ni
eich codeiddiad chi
eu codeiddiad nhw/hwy
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