Unusual decay modes of D0 and D+ mesons.

CLEO has measured decay modes of the D 0 and D + into states consisting of K ±, s, π ±, s, K 0, s and K 0, s, using data taken with the CLEO detector at the Cornell Electron Storage Ring. We report new results on the decays of D 0, s into 4π ± ,K − K + π − π + ,K 0 K + K − ,K 0 K + π − ,K 0 K − π + ,3K S 0 and K 0 Φ together with some of their resonant substructure. We also present the first observation of the decay D + →K 0 K 0 K + and give limits on the doubly-Cabibbo-suppressed decays of the D 0 into K + π − and K + π − π + π −