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// Function that calculates area of a square
function areaOfSquare(side){
  return side * side
}
const sqArea = areaOfSquare(3)
console.log('area of square: ' + sqArea)
// This is a function that calculates the 
// surface area of a cube that *reuses* the areaOfSquare function
function surfaceAreaOfCube(side){
  return 6 * areaOfSquare(side)
}
const surfaceArea = surfaceAreaOfCube(7)
console.log('surface area of a cube ' + surfaceArea)
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