in English is:

watershed

Mutations

Soft:ddiwelfa
Nasal:niwelfa
Aspirate:(no mutation)

Use

y ddiwelfa hon
fy niwelfa i
dy ddiwelfa di
ei ddiwelfa ef/o
ei diwelfa hi
ein diwelfa ni
eich diwelfa chi
eu diwelfa nhw/hwy
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