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>perl -wMstrict -le "my $s = 'a X bar XX c XXX d XXXX e XXXXX foo XXXXXX g'; ... 'XX e XX' 'XX foo XX' 'XX g'
>perl -wMstrict -le "my $s = 'a X bar c XXX d XXXX e XXX de XXX foo XXXXXX g h'; ... 'XX foo XX' :XX :foo: XX: 'XX g h' :XX :g: h: ' h' : :h::