Using gates other than 4:2-adders and conditional sum adder

1

I wanted to make sure if i understood the demanding of the last question at project 5,
are we suppose to complete the multiplier using only 4:2-adders and conditional sum adder which we built before?
or we can use other gates like MUX or AND?

2

You may use extra gates if you need them. However, make sure your solution uses the long multiplication algorithm mentioned in the PDF.