code: def all_transitions(transition_lists):
      """
      Given a list of transition lists, combine them all into a list of unique transitions.
      """
      transitions = set()
      for trans_list in transition_lists:
          transitions.update(trans_list)
      return sorted(transitions)
  
file_path: stanza/stanza/models/constituency/transition_sequence.py
imports: import logging
  from stanza.models.common import utils
  from stanza.models.constituency.parse_transitions import Shift, CompoundUnary, OpenConstituent, CloseConstituent, TransitionScheme, Finalize
  from stanza.models.constituency.tree_reader import read_trees
  from stanza.utils.get_tqdm import get_tqdm
label_desc: Use image node_id 6 for calling a global function with example usage: all_transitions(transition_lists) and returns: sorted