comefrom: <garvit244>1079_1.py
code: def numTilePossibilities( tiles):
      if not tiles:
          return 0
      
      import collections
      unique = set(tiles)
      freq_map =  collections.Counter(tiles)
      total_len = 1
      while total_len < len(tiles):
          new = set()
          for char in tiles:
              for comb in unique:
                  new_seq = comb+char
                  up_freq = collections.Counter(new_seq)
                  flag =True
                  for key, val in up_freq.items():
                      if val > freq_map[key]:
                          flag = False
                  if flag:
                      new.add(new_seq)
          unique.update(new)
                  
          total_len += 1
      return len(unique)
masked: def sample_funcname ( var_0 ) :
      if not var_0 :
          return 0
      import var_1
      var_2 = set ( var_0 )
      var_3 = var_1.Counter ( var_0 )
      var_4 = 1
      while var_4 < len ( var_0 ) :
          var_5 = set ( )
          for var_6 in var_0 :
              for var_7 in var_2 :
                  var_8 = var_7 + var_6
                  var_9 = var_1.Counter ( var_8 )
                  var_10 = True
                  for var_11 , var_12 in var_9.items ( ) :
                      if var_12 > var_3 [ var_11 ] :
                          var_10 = False
                  if var_10 :
                      var_5.add ( var_8 )
          var_2.update ( var_5 )
          var_4 += 1
      return len ( var_2 )
  