{{Graph[C1[7], C2[8], C3[7], Dashed[7, 9], Dashed[8, 9], Dashed[8, 9], 
    OV[1, 3, 4], OV[2, 5, 6], OV[4, 5, 6]], 
   Graph[C1[7], C2[8], C3[9], Dashed[7, 8], Dashed[7, 9], Dashed[8, 9], 
    OV[1, 4, 5], OV[2, 4, 6], OV[3, 5, 6]], 
   Graph[C1[7], C2[7], C3[8], Dashed[7, 9], Dashed[8, 9], Dashed[8, 9], 
    OV[1, 2, 4], OV[3, 5, 6], OV[4, 5, 6]], 
   Graph[C1[7], C2[8], C3[8], Dashed[7, 9], Dashed[7, 9], Dashed[8, 9], 
    OV[1, 4, 5], OV[2, 3, 6], OV[4, 5, 6]]}, 
  {BasisVector[1] + 2*BasisVector[2], 2*BasisVector[2] - BasisVector[3], 
   BasisVector[3] - BasisVector[4]}}