Sketch: PQRSTVW 1. Never {RT} 2. P-> T = ~T->~P 3. ~R->~V = V->R 4. W or T-> {WT} = ~{WT}-> ~W and~T 5. S or Q, but not both There are obviously deductions to be made. However, in selection games it is better to remember there are causal chains and use them as the questions demand....