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sierpinski.sed
1 x;s/^$/@/;p 2 s/.*/c & / 3 :loop 4 s/c \( \)/ c\1/ 5 s/c@\(@@\)/ c\1/;tloop 6 s/c.\(..\)/@c\1/;tloop 7 8 s/c.*// 9 10 x;d 11
