*
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$n * $m evaluates to the product of $n times $m.
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/
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$i / 9 evaluates to the value of $i divided by 9. Note that integer arithmetic is used; thus, if $len=30, the command $divvy=$len/9; message "$divvy" yields 3, not 3.3334.
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%
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5 % 2 evaluates to the remainder of 5 divided by 2, or “1”.
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