code: def non_equality_cases():
      return list(
          itertools.combinations(
              [pipeline_first(), pipeline_second(), pipeline_third()], 2
          )
      )
  
file_path: FEDOT/test/unit/pipelines/test_pipeline_comparison.py
imports: import itertools
  from copy import deepcopy
  import pytest
  from fedot.core.pipelines.node import PipelineNode
  from fedot.core.pipelines.pipeline import Pipeline
label_desc: Use image node_id 6 for calling a global function with example usage: non_equality_cases() and returns: list