1-)Four friends Ali, John, Rahim and Hakan go to bar individually, in doubles, triple or altogether.

There are some constraints in drinking alcohol.

Ali drinks if John is with him.

John always drinks

Rahim drinks if John is not there

Find the logical statement (condition) for drinking not to take place in the bar.

2-)Design a universal shift register which can shift left, right or parallel depending of selection switch condition.