code: def merge_char(sequences, space="_"):
      """Merge characters sequences into word sequences.
  
      Arguments
      ---------
      sequences : list
          Each item contains a list, and this list contains a character sequence.
      space : string
          The token represents space. Default: _
  
      Returns
      -------
      The list contains word sequences for each sentence.
  
      Example
      -------
      >>> sequences = [["a", "b", "_", "c", "_", "d", "e"], ["e", "f", "g", "_", "h", "i"]]
      >>> results = merge_char(sequences)
      >>> results
      [['ab', 'c', 'de'], ['efg', 'hi']]
      """
      results = []
      for seq in sequences:
          words = "".join(seq).split(space)
          results.append(words)
      return results
  
imports: import os
  import torch
  import logging
  import numpy
  import pickle
  import hashlib
  import csv
  import time
  import torchaudio
  import json
  import re
  from speechbrain.utils.torch_audio_backend import check_torchaudio_backend
label_desc: Use image node_id 24 for calling a global function with example usage: merge_char(sequences, space) and returns: results