function squarethings()
  local e, i = " ", 1
  print("Up to what number should I square:")
  e = read()
  if e == "stop" then 
    print("Happy to oblige.")
    return
  else
    e = e + 1
    if i < e then
      repeat
       local squared = i * i
       print(i.." x "..i.." = "..squared)
       sleep(0.3)
      until i == e
      squarethings()
    else
      print("Error, number already squared, or a word has been inputted. Try again.")
      sleep(0.2)
      squarethings()
    end
  end
end
squarethings()