相手 あいて さき選択 せんたく接続 せつぞくであれば
aitesaki sentakusetsuzokudeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 相手先選択接続

1. If the connection is selectable by the other party; If the other party chooses the connection

Ba Conditional
Computing