code: def merge_methods():
      return ["Merge", "Preserve", "Discard", "Segment"]
  
imports: import numpy
  import pytest
  import cellprofiler.modules.combineobjects
  import cellprofiler_core.image
  import cellprofiler_core.measurement
  import cellprofiler_core.object
  import cellprofiler_core.pipeline
  import cellprofiler_core.workspace
label_desc: Use image node_id 12 for calling a global function with example usage: merge_methods() and returns: list