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  1. or download this
    c:\@Work\Perl\monks>perl -wMstrict -le
    "my @files = qw(xxx  1st_CF_xx  CF__  2nd_CF_yy  CF);
    ...
     if ($n_CF_ == 1) { print qq{just one: '$first_CF_'}; }
    "
    number of _CF_ files: 0