in English is:

dualism

Mutations

Soft:ddeuoliaeth
Nasal:neuoliaeth
Aspirate:(no mutation)

Use

y ddeuoliaeth hon
fy neuoliaeth i
dy ddeuoliaeth di
ei ddeuoliaeth ef/o
ei deuoliaeth hi
ein deuoliaeth ni
eich deuoliaeth chi
eu deuoliaeth nhw/hwy
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