in English is:

functionalism

Mutations

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

Use

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