Correction: This table should have read as follows: 2n-gon where 2n = 4 6 8 10 12 14 16 18 20 22 24 26 28 30 . . . ------------------------------------------------------------------- g = 1 1 2 2 3 3 4 4 5 5 6 6 7 7 . . . where g = genus. --Dan ________________________________________________________________________________________ It goes without saying that .