message: Update valid-anagram.py
  Added two more methods
diff: @@ -38,6 +38,21 @@ class Solution:
  return True
  + def isAnagram2(self, s, t):
  + return all([s.count(c)==t.count(c) for c in string.ascii_lowercase])
  +
  + def isAnagram3(self, s, t):
  + if len(s) != len(t):
  + return False
  + count = collections.defaultdict(int)
  + for c in s:
  + count[c] += 1
  + for c in t:
  + count[c] -= 1
  + if count[c] < 0:
  + return False
  + return True
  +
  # Time: O(nlogn)
  # Space: O(n)
  class Solution2:
  