<P> For example, the complement of a 7 - cell cage totalling 41 is a 2 - cell cage totalling 4 (because 9--7 = 2 and 45--41 = 4). As a 2 - cell cage totalling 4 can contain only 1 and 3, we deduce that a 7 - cell cage totalling 41 contains neither 1 nor 3 . </P> <P> The following tables list the possible combinations for various sums . </P> <Dl> <Dt> 1 cell </Dt> </Dl> <Dl> <Dt> 2 cells </Dt> </Dl>

The sum of all numbers in any nonet row or column must match the small number printed in its corner