Problem 2 (5pts). Modified from Sethi]. Show the answer in normal form for expression twice twice f ar where twice is Afa.f(f r) Note: you do not need to show reduction steps to receive full credit. Write the normal form expression if it exists, and write "Normal form does not exist" otherwise. Problem 2 (5pts). Modified from Sethi]. Show the answer in normal form for expression twice twice f ar where twice is Afa.f(f r) Note: you do not need to show reduction steps to receive full credit. Write the normal form expression if it exists, and write "Normal form does not exist" otherwise