Solve the no connection puzzle: Difference between revisions
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{{trans|Fortran}}
Unlike the Fortran from which it was migrated, this m4 program stops at the first solution. The holes are represented by positions in a string; you can regard the string as a variable-size array. (m4 is, of course, a string-manipulation language.)
The program ought to work with any POSIX-compliant m4. The display has been changed to use only ASCII characters, because very old m4 cannot handle UTF-8.
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