':type s: str
:rtype: List[str]'

def findRepeatedDnaSequences2(self, s):

    (l, r) = ([], [])
    if (len(s) < 10):
        return []
    for i in range((len(s) - 9)):
        l.extend([s[i:(i + 10)]])
    return [k for (k, v) in collections.Counter(l).items() if (v > 1)]
