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  1. or download this
    >perl -wMstrict -le
"my $text = 'XXXXXaXXXXX';
...
 }
"
a
  2. or download this
    >perl -wMstrict -le
"my $text =
...
[[XXXXaXXXXbYYYYYcYYYYYdXXXXeXXXXfgXXXX
XXXXhXXXXiYYYYY]]
'aeh'
  3. or download this
    >perl -wMstrict -le
"for my $text (qw(
...
'XXXXxyXXXXxyXXXX' -> ''
'YYYYYaYYYYY' -> ''
'ZZZaZZZ' -> ''