For example, if we consider the pair ("u", "v") = (8, 12), then "u" + "v" = 20 and "v" + "u*" = 6; and we will have ± 6 and ± 10 even bone numbers at our disposal. Taking "c" = ± 6, we have the sum "u" + "v" + "c" to be 26 and 14, depending on the sign of "± 6" taken, both of which do not fall within the sets "D" or "S". Likewise, taking "c" = ± 10, we have the sum "u" + "v" + "c" to be 30 and 10, both of which again do not fall within the sets "D" or "S". Thus, the pair (8, 12) is not admissible. By similar process of reasoning, we can also rule out the pair (6, 12).