code: def combining_goal(state):
          
          ((corner, edge), (L, U, F, D, R, B)) = state
          if "U" not in corner or "U" not in edge: return False
          if set(edge).issubset(set(corner)): return True
          elif set(edge.facings.keys()).issubset(set(corner.facings.keys())): return False
          opposite = {"L":"R", "R":"L", "F":"B", "B":"F"}
          edge_facings = list(edge)
          for i, (face, square) in enumerate(edge_facings):
              if face == "U":
                  if square != corner[opposite[edge_facings[(i+1)%2][0]]]:
                      return False
              else:
                  if square != corner["U"]:
                      return False
          return True
docs: Check if two Cubies are combined on the U face.