Karnatakabhashabhushana 5.3

In the dual and plural, m [replaces] n.

When the sphere of duality or plurality is intended to be expressed, the phoneme m occurs in place of the phoneme n:

nīmuṁ [‘you (pl.)’],

āmuṁ [‘we’],

tāmuṁ [‘themselves’],

nimage [‘to you (pl.)’],

emage [‘to us’],

tamage [‘to themselves’],

nimma [‘of you (pl.)’],

emma [‘of us’],

tamma [‘of themselves’],

nimmoḷ [‘in you (pl.)’],

emmoḷ [‘in us’],

tammoḷ [‘in themselves’].