in English is:

intranet

Mutations

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

Use

y fewnrwyd hon
fy mewnrwyd i
dy fewnrwyd di
ei fewnrwyd ef/o
ei mewnrwyd hi
ein mewnrwyd ni
eich mewnrwyd chi
eu mewnrwyd nhw/hwy
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