Sumerian language
Use of the ventive as a 1st person marker

When the dimensional prefix is dative -/a/-, the personal prefix of the 1st person appears to be absent, but the 1st person reference is expressed by the choice of the ventive conjugation prefix /mu/-. The sequence that expresses the 1st person dative is then: /mu-/ + /-a-/ → 𒈠 ma-. When the intended meaning is that of the directive -/i/~/e/- ("on me", "in contact with me", etc.), it seems that the ventive conjugation prefix 𒈬 mu- alone serves to express it.
change_case:english_capital, combination:repeat_prompt