ã¿ãã´ã¼æ¥è¨ ç´ å æ°å解ããã¡ãã³ã¼ããæ¸ããã¨ã§ããã®æããæé 天 Gaucheã§ã¨ã©ãã¹ããã¹ã®ç¯©ã§ç´ æ°ã¹ããªã¼ã (ä¸éä¸è¬ã®ãã¤ããéã)ã§ç ´å£åã°ã¤çï¾ (use util.stream) (define (composites s) (stream-delay (let1 p (stream-car s) (stream-cons (expt p 2) (xor (stream-map (pa$ * p) (xor (stream-cdr s) (composites s))) (composites (stream-cdr s))))))) (define (xor s0 s1) (stream-delay (let ((x (stream-car s0)) (y (stream-car s1))) (cond ((= x y) (xor (stream-cdr s0) (st
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