LAWRENCE, Kan. — Looking as if it was still stinging from Monday’s loss at No. 20-ranked Texas, No. 8 Kansas played from behind for much of the game before rallying to defeat unranked Oklahoma, 71-69, on Saturday afternoon at Allen Fieldhouse. The Jayhawks (20-4, 9-2 Big 12), who trailed by eight points with 2:41 remaining in the first half and three points at halftime — not to mention five points with nine minutes to play — grasped a one-point lead on a straight-on 3-point basket by Zach Clemence — yes, Zach Clemence — with 6:55 left and didn’t surrender it. Jalen Wilson scored 22 points with…