here the conviction rests on Itumstantial evidence, see United State/ Joyner, 639 F.2d 1162, 1166 (8th Cir.), denied, 429 (1976); United States Shahan., supra at U.S. 988, 97 S.CL 41 50 L.Ed2d 593 1177, since circumstan evidence is intrin- slant s probative as direct evidence. Hol- land United S