code: def get_somatic_variantcallers(items):
      
      out = []
      for data in items:
          vcs = dd.get_variantcaller(data)
          if isinstance(vcs, dict) and "somatic" in vcs:
              vcs = vcs["somatic"]
          if not isinstance(vcs, (list, tuple)):
              vcs = [vcs]
          out += vcs
      return set(vcs)
docs: Retrieve all variant callers for somatic calling, handling somatic/germline.