in English is:

smog

Mutations

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

Use

y mwrllwch hwn
fy mwrllwch i
dy fwrllwch di
ei fwrllwch ef/o
ei mwrllwch hi
ein mwrllwch ni
eich mwrllwch chi
eu mwrllwch nhw/hwy
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