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            # BSD documentation says 'X' is to be ignored unless
            # the operator is '+'. GNU, HP, SunOS and Solaris handle
...
                    # GNU and SunOS get this wrong;
                    # Solaris, HP and OpenBSD get it right.
                    next unless -d $file || grep {$orig {$_} & 1} @ugo
+;

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=item B<X>

...
bits. Furthermore, this permission is ignored if I<operator> is either
B<E<45>> or B<E<61>>.