please help me solve these questions from the image below.

Problem 2. Explain what happens if the NAND latch of the previous problem is modified as follows: Problem 3. An engineer is controlling 8 machines by using the parallel port of a micro-controller; there are numbered from 1 to 8 . Certain process requires to turning ON the machines 2,3 and 5 ; then toggle the machines 4 and 6 , and finally turning OFF the machines 1,3 and 6 . The other machines remain unaltered in any step. What steps would you follow using bitwise operations to drive the parallel port? Problem 4. Prove your design in Problem 3 by considering two different initial configurations