Let M be the set of all the relation on A={1,2,3}

Let S be the following relation on M:

for R1, R2 relations on A, (R1,R2) Î S iff R1oR2 = R2oR1

(o - composition)

prove that S is not an equivalence relation on M

I am having a little problem with this...

I guess I need to prove that S is not transitive but I can't figure it out....

any directions would be appreciated

thanks