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Copyright © 2002 by Rainer Typke No zero occurs in this puzzle. Across: A: D down + M across E: the digit sum of K down multiplied with M across F: a square number G: the greatest common divisor of G across and the reverse of H across equals the reverse of J down. H: a palindrome I: a prime number K: a cubic number M: a palindrome Down: A: the greatest common divisor of A down and H across equals J down. B: a prime number C: both C down and its reverse are prime numbers. D: M across multiplied with H across E: A down multiplied with A down's first digit J: a prime number K: the reverse of L down L: L down < F across