code: def find_split_node(mst_wood, i):
      
      for mst_index, mst in enumerate(mst_wood):
          if i in mst['strokes']:
              return (mst_index, mst['strokes'].index(i))
      raise ValueError('%i was not found as stroke index.' % i)
docs: Parameters
      ----------
      mst_wood : list of dictionarys
      i : int
          Number of the stroke where one mst gets split
  
      Returns
      -------
      tuple :
          (mst index, node index)