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  1. or download this
        open STDIN, '<&', $fh
        or do { warn "set STDIN = \$fh=\\$fh: $!"; return undef; };
  2. or download this
        open my $oldin, "<&STDIN"
        or do { warn "dup STDIN to \$fh=\\$fh: $!"; return undef; };
  3. or download this
    C:>perlver t\03_input_processing.t

...
     | Minimum syntax version   : v5.6.0                        |
     | Minimum version of perl  : v5.6.0                        |
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