Aporia (ἀπορίᾱ doubt) is an artifice by which a speaker feigns doubt as to where he shall begin or end or what he shall do or say, etc. Cp. “Then the steward said within himself, What shall I do?” St. Luke 16. 3.
ἀπορῶ τοῦ πρώτου μνησθῶ
I am uncertain what I shall recall first 18.129. When the doubt is between two courses it is often called diaporēsis.