Use the Laws from the Table of Logical Equivalences (see LEC 2 notes page 5) to show the following logical equivalence holds: 

(P∧S)=⇒(Q=⇒R) ≡ Q=⇒((P∧S)=⇒R) You must use exactly ONE law per step and you must write the name of the law to the right of the equivalence. Be careful not to omit necessary parentheses!