Santee irregular verb.

[Robert L. Rankin]

I was prowling through Boas and Deloria's _Dakota Grammar_ (always a
profitable passtime for a Siouanist) and ran across a partial conjugation
for the compound verb /yakhuN/ < {yakha+'uN} 'to be' in Santee on p. 98.

2sg	dakhA-nuN
incl.	'uN-yak-'uN-pi (f.n. 22)

Does anyone know the 1st person form of this verb?  I would guess
/b-dakha-muN/, but I'd like to confirm it.

Bob