code: def get_all_database_accessions(chebi_ids):
      '''Returns all database accessions'''
      all_database_accessions = [get_database_accessions(chebi_id)
                                 for chebi_id in chebi_ids]
      return [x for sublist in all_database_accessions for x in sublistf get_all_database_accessions(chebi_ids):
      '''Returns all database accessions'''
      all_database_accessions = [get_database_accessions(chebi_id)
                                 for chebi_id in chebi_ids]
      return [x for sublist in all_database_accessions for x in sublist]
docs: Returns all database accessions