Using Digital Logic Gates and Truth tables, Solve following: $1.$ 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.