in English is:

vernalization

Mutations

Soft:wanwyneiddiad
Nasal:ngwanwyneiddiad
Aspirate:(no mutation)

Use

y gwanwyneiddiad hwn
fy ngwanwyneiddiad i
dy wanwyneiddiad di
ei wanwyneiddiad ef/o
ei gwanwyneiddiad hi
ein gwanwyneiddiad ni
eich gwanwyneiddiad chi
eu gwanwyneiddiad nhw/hwy
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