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A numeric vector expression is an expression whose value is a numeric vector.
You can check the outcomes of the following examples with the calculator.
   11.5
   13.5
   17.5
zero# (5)
   0
   0
   0
   0
   0
repeat# ({ 1, 5 }, 6)
   1
   5
   1
   5
   1
   5
   1
   5
   1
   5
   1
   5
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