PLEASE EXPLAIN STEP BY STEP

Show that the following arguments are valid using rules of inference. is used for horizontal record of arguments: statements to the left of are premises and statement to the right of is a conclusion.

(a) p q, q (r s), r (w u), p w u

(b) (p q) (r s), r w, w p

(c) p q, q r, r p

(d) u r, (r s) (p w), q (u s), w q p