(a) (2 points) For integers a, b, c, d, e, f, find ((a, b) (c, d)) (e, f) in the form (x, y), where each of x and y is an expression given in terms of a, b, c, d, e, f. In each expression, i.e., x and y, write the variables in each term from earliest letter in the alphabet to latest (adf instead of af d ) and write the terms in lexicographical order (dictionary order) from left to right (the term ace before the term adf). (b) (2 points) Repeat part (i) for (a, b) ((c, d) (e, f)). (c) (2 points) Is the operation associative? Briefly remark on how part (a) informs