2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/137229We prove that $K_{n}$ is $\mathbb{Z}_{2}^{2}$-cordial if and only if $1 \leq n \leq 3$ and that $K_{m,n}$ is $\mathbb{Z}_{2}^{2}$ if and only if it is false that $m=n=2$.4 pagesCombinatorics05C78text