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  1. or download this
    qw(foo bar))[$_[0]] 
would still yield 'foo' when @_ is empty (therefore, $_[0] is undef).
  2. or download this
    Enter h or `h h' for help, or `man perldebug' for more help.

...
0  3
  DB<3> x 3 * $ARGV[0]
0  0