in English is:

percolation

Mutations

Soft:drylifiad
Nasal:nhrylifiad
Aspirate:thrylifiad

Use

y trylifiad hwn
fy nhrylifiad i
dy drylifiad di
ei drylifiad ef/o
ei thrylifiad hi
ein trylifiad ni
eich trylifiad chi
eu trylifiad nhw/hwy
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