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Of course: P. and V. δήπου, Ar. and P. δήπουθεν.
Ironically: P. and V. δῆθεν.
In answer to a question, assuredly: P. and V. πώς γὰρ οὔ; μάλιστά γε, Ar. and P. κομιδῇ γε, ἀμελεῖ, V. καὶ κάρτα, καὶ κάρτα γε; see yes.