in English is:

literacy

Mutations

Soft:lythrennedd
Nasal:(no mutation)
Aspirate:(no mutation)

Use

y llythrennedd hwn
fy llythrennedd i
dy lythrennedd di
ei lythrennedd ef/o
ei llythrennedd hi
ein llythrennedd ni
eich llythrennedd chi
eu llythrennedd nhw/hwy
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