Relations of equivalence

Question

Given the set $A=(1,2,3,4,5,6)$ and the conditions $2R3$, $4R2$, $1R/2$, $1R/6$, $|A/R|=2$.

The relations of equivalence are:

$((2,3,4,5,6),(1))$

$((2,3,4,6),(1,5))$

?