Find a particular list inside a list of lists
I got two different lists (let's call them A and B) of lists and I have to find the elements that are in B and not in A and viceversa. The lists inside the two main lists can be unordered and they basically contains strings. I'm looking for a code or an hint to solve this problem. 
Find a particular list inside a list of lists
===

I got two different lists (let's call them A and B) of lists and I have to find the elements that are in B and not in A and viceversa. The lists inside the two main lists can be unordered and they basically contains strings. I'm looking for a code or an hint to solve this problem. 