PER CURIAM.
This appeal is from a conviction of robbery. Counsel appointed by this court contend that certain evidence was erroneously admitted. Appellant’s trial counsel introduced this evidence. We think its admission should not, in the circumstances of this case, lead us to reverse the conviction by virtue of the plain error rule, F.R.Crim.P. [rule] 52 (b), 18 U.S.C.A. Affirmed.