in English is:

couple

Mutations

Soft:ddeuddyn
Nasal:neuddyn
Aspirate:(no mutation)

Use

y deuddyn hwn
fy neuddyn i
dy ddeuddyn di
ei ddeuddyn ef/o
ei deuddyn hi
ein deuddyn ni
eich deuddyn chi
eu deuddyn nhw/hwy
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