$(10$ marks$)$ Using two flip$-$flops the edge triggered D flip$-$flop can be created as below.

$($a$)$ This flip$-$flop stores the value on its Data pin on the rising edge of the Enable pin i$.$e$.$ Enable changes from $0$ to $1.$ What change would you make to this circuit to store the value on the falling edge of the Enable pin i$.$e$.$ Enable changes from $1$ to $0.$ Briefly describe how this works. $(3$ marks$)$

$($b$)$ The dead$-$hang is a simple exercise that has recently regained popularity. It consists of simply gripping and hanging from a pull$-$up bar for as long as possible. Your local gym has decided to host a tournament to find out who is the best dead$-$hanger and has asked you to come up with a simple circuit to automate this. The tournament consists of a head$-$to$-$head dead$-$hang battle between two contestants with the contestant who holds on to the bar the longest winning. Design a circuit that determines a winner of the head to head battles $($You are given a push$-$button that determines whether someone is holding onto the bar or not$).$