in English is:

gymnastics

Mutations

Soft:(no mutation)*
Nasal:ngymnasteg
Aspirate:(no mutation)

* This form is an exception to the mutation rules.

Use

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