How to check a txr contain all the element in a list? : like I have a txt and read it already using

    with open(full_path,'r') as f2:
    contents = f2.read()
content like:
    `sadasdasdasdsa dasdasdasdffsdf  [sdas] aaa dfdsfdsfdfds bbb`

and I have a list like 

    a = ['aaa','bbb']
    b = ['343242','bbb']
We could see all element in list`a` are in `content`, `b` not.   but how could I check it in a loop? like if a in content print `ok` else print `not`. Thanks!!
