Now set of pairs: (a, a) (a, f) (f, a) (a, h) (h, a) (b, b) (c, c) (d, d) (e, e) (e , f) (f, e) (f, f) (g, g) (h, h) (a, e) (e, a) (e, h) (h, e) (f, h) (h , f) – is an equivalence relation, we can identify it [...]