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  1. or download this
    >perl -wMstrict -le
"my ($w, $x, $y) = qw(YUU EKS);
...
 print qq{'$interpol'};
"
'hi from 'YUU' and EKSalso [['$y' undefined]] and [['$z' non-existant]
+] too'
  2. or download this
    >perl -wMstrict -le
"my ($w, $x, $y) = qw(YUU EKS);
...
 '[['$z' non-existant]]' '[['$z' non-existant]]'
  '[['$z' non-existant]]' '[['$z' non-existant]]'
'