As another example, if we consider the pair ("u", "v") = (10, 12), then "u" + "v" = 22 and "v" + "u*" = 2; and we will have ± 6 and ± 8 even bone numbers at our disposal. Taking "c" = ± 6, we have the sum "u" + "v" + "c" to be 28 and 16. While 28 does not fall within the sets "D" or "S", 16 falls in set "S". By inspection, we find that if ("a", "b") = (-7, -9), then "a" + "b" = -16; and it will satisfy the first constraint equation. Also, taking "f" = ± 8, we have the sum "v" + "u*" + "f" to be 10 and -6. While 10 does not fall within the sets "D" or "S", -6 falls in set "D". Since -7 and -9 have already been assigned to "a" and "b", clearly ("d", "e") = (-5, 11) so that "d" + "e" = 6; and it will satisfy the second constraint equation.