Deep thought : deductive proofs. I'm stuck on what steps to take next in order to get to X or S.

if Z then (if not Y then X) Z and not W orf T then S) Options not Y orT Rules M P DS SIMP HS DN MT ADD CONJ CD DEM SIMP not W if not Y then X MP if T then 3 DS MPL TRANS (if T then S) and (if not Y then X)lcoN EQUIV CONJ COM ASSOC DIST EXP ABS TAUT X or S Instantiate TOTALS Level 1:0/8Level 2:017Level 3:0/10 CURRENT 1-5 Hint