事前 じぜん購入 こうにゅう割引 わりびき運賃 うんちんでしょう
jizenkōnyūwaribikiunchindeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 事前購入割引運賃

1. Probably a pre-purchase discount fare.; Likely a discounted advance purchase ticket.

Polite
Presumptive
Conjecture