The affix sic before ātmanepada affixes is kit optionally when yam means 'to expose'.,
Thus उपायत कन्याम् or उपायंस्त कन्याम् 'he espoused the girl,' उपायत or उपायंस्त भार्याम् 'he espoused his wife.'
The word 'Upayamana' in the sutra means 'to accept in marriage,' 'to espouse.' The verb यम् preceded by the preposition उप is Atmanepadi when it means 'to espouse' by Rule (1. 3. 56).,