For those who, like me, were puzzled about the idea of using 'x' in a list context, check out the 'perlop' manpage:

Binary "x" is the repetition operator. In scalar context, it returns a string consisting of the left operand repeated the number of times specified by the right operand. In list context, if the left operand is a list in parentheses, it repeats the list.

           @ones = (1) x 80;           # a list of 80 1's
           @ones = (5) x @ones;        # set all elements to 5
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