• 5FU

  • 15LS

  • 9IT

  • 17OR


1st letter :1 + 4 = 5 + 4 = 9 + 4 = 13 + 4 = 17 2nd letter :C + 3 = F + 3 = I + 3 = L + 3 = O 3rd letter :V - 1 = U - 1 = T - 1 = S - 1 = R Thus, the term 15LS is wrong and must be replaced by 13LS.