With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Dari and I vented our aggravation by drafting the attached letter to Gibson and Kyle complaining of Sommer 's duplicity , but after tempers cooled , MKM and I decided not to send it to Stan or urge him to send a written response .
text_B: The attaching did not happen
not-entailed.