code: def looks_like_implicit_value(v):
      
      assert isinstance(v, basestring)
      if feature.is_implicit_value(v):
          return 1
      else:
          split = v.split("-")
          if feature.is_implicit_value(split[0]):
              return 1
  
      return 0
docs: Returns true if 'v' is either implicit value, or
      the part before the first '-' symbol is implicit value.