Please write purpose of function 1, function 2, function 3a and 3b. Thank you

(6 points) What is the purpose of the following Python3 functions? Note: One, general description for function3a and function3b is enough. def function3a(x,l): return +x] , x]+1] print(function3a(5, [2,3])) def function3b(l): #some comment if len L)0: if len(1) 1: #some comment fori in rangeClencl)): return 1 return [l] def function1(): def function2(s1,s2): for i in rangeClen(l)) if li] in 1i+1:]: print(i]) for i in sl: else: ifi in s2: for p in function3b(rl): t.append([m] p) a.appendLLi]) 1.appendCi) return a return set(l) return t