Hi, just a small variation on an already posted solution ... data want; want = 0; do until (last.id); set have (in=one) have; by id; if one and have then want = 1; if ^one then output; end; run; It's based on Howard Schreier's idea of a "self-interleave" ... Interleaving a Dataset with Itself: How and Why http://www.lexjansen.com/nesug/nesug03/cc/cc002.pdf
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