duplicate certain lines _C_ by m.ukai

open String
let rec(@)s i=sub(s^"__")0 2="d "&sub s 2(length s-2)@i+1;i=0&read_line()@1;print_endline s;s@i-1;;""@0

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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