n paired items 400 (kvfull 400, kvctx 400)
hop-3 laundered kvfull 20.0%  kvctx 55.5%  D = +35.5 pp [+30.8, +40.2]
kvfull: hop-3 adopt 96/400; A3 != A2 80/400; laundered where A2 correct 79/380 = 20.8%
kvctx: hop-3 adopt 222/400; A3 != A2 223/400; laundered where A2 correct 221/399 = 55.4%
