in English is:

periodicity

Mutations

Soft:gyfnodedd
Nasal:nghyfnodedd
Aspirate:chyfnodedd

Use

y cyfnodedd hwn
fy nghyfnodedd i
dy gyfnodedd di
ei gyfnodedd ef/o
ei chyfnodedd hi
ein cyfnodedd ni
eich cyfnodedd chi
eu cyfnodedd nhw/hwy
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