The set { {6}, {7,8}, {9}, {10} } is a partition of the set a.

define the equivalence relation r on the set a whose equivalence classes are given in the partition by listing all ordered pairs in the relation.

make sure to use parentheses for each ordered pair with a comma separating the coordinates but no other symbols. for example (a, a) (a, b) (a, c) . . (make sure to include all but only ordered pairs that are in the relation)