discussed Cited "see" United States v. Robert Dale Gray Because of this purpose, we have held that if two or more prior drug felony convictions “result from acts forming a single criminal episode, they should be treated as a single conviction for sentencing enhancement under section 841(b)(1)(A).” United States v. Millard, 139 F.3d 1200, 1209 (8th Cir.1998) (citing United States v. Rice, 43 F.3d 601, 605-06 (11th Cir.1995)); accord United States v. Liquori, 5 F.3d 435, 437 (9th Cir.1993), ce rt. denied, 510 U.S. 1063 , 114 S.Ct. 738 , 126 L.Ed.2d 701 (1994); United States v. Pace, 981 F.2d 1123, 1131-32 (10th Cir.1992), cert. denied, 507 U.S. 9…