Kelasnya terdiri atas \(\{\emptyset,\{a\},\{a,b\},\{a,c\},X\}\text{,}\) \(\{\emptyset,\{b\},\{a,b\},\{b,c\},X\}\text{,}\) dan \(\{\emptyset,\{c\},\{a,c\},\{b,c\},X\}\text{.}\)