in English is:

concatenation

Mutations

Soft:gydgadwynedd
Nasal:nghydgadwynedd
Aspirate:chydgadwynedd

Use

y cydgadwynedd hwn
fy nghydgadwynedd i
dy gydgadwynedd di
ei gydgadwynedd ef/o
ei chydgadwynedd hi
ein cydgadwynedd ni
eich cydgadwynedd chi
eu cydgadwynedd nhw/hwy
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