Likewise, taking "c" = ± 8, we have the sum "u" + "v" + "c" to be 30 and 14. While 30 does not fall within the sets "D" or "S", 14 falls in set "S". By inspection, we find that if ("a", "b") = (-5, -9), then "a" + "b" = -14. Also, taking "f" = ± 6, we have the sum "v" + "u*" + "f" to be 8 and -4. While 8 does not fall within the sets "D" or "S", -4 falls in set "D". Clearly, ("d", "e") = (-7, 11) so that "d" + "e" = 4, and the second constraint equation will be satisfied.