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sqrt = function(n) {
  
  var original = n  
  var found = 0
  
  function loop(n) {
    if ((n*n) == original) {
      found = n
    } else {
      loop(--n)
    }
    
    if (n <= 0) return
    
  }
  loop(original)
  
  return found === 0 ? 'doesnt have one' : found
}


var s = sqrt(81)
console.log ("square root is: ", s)