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  1. or download this
    "@{[ reverse 1 .. 3 ]} go!"   # reverse 1 .. 10 is in list context
"2 + 2 = ${\( 2 + 2 )}";      # 2 + 2 is in scalar context
  2. or download this
    /^[a-z]{@{[ WORD_LENGTH ]}}$/i
/^[a-z]{${ \WORD_LENGTH }}$/i