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  1. or download this
    >perl -wMstrict -le
"my @ra = (1,2,3,4,5);
...
"
Use of uninitialized value in join or string at -e line 1.
12345
  2. or download this
    >perl -wMstrict -le
"my @ra = (1,2,3,4,5);
 { $\" = '';  print qq{@ra}; }
"
12345