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