in English is:

dodecaphonism

Mutations

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

Use

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