opinion: PER CURIAM.
  The appeal is from a judgment of conviction of robbery, in violation of D.C. Code § 22-2901, and is rested upon the admission of evidence now claimed to have been inadmissible. In view of all the circumstances of the case we think it is not one for the exercise of our discretion permitted by Rule 52(b), Fed.R. Crim.P.
  Affirmed.