35. 18 Thompson's tetrahedron D B 110] (11)(d) (I1 Ir(a) <I0 C A(=0),B(0-),C(0 D(000§5.18 Thompson’s tetrahedron ), (000) 2 1 2 1 ), (0 2 1 0 2 1 0), ( 2 1 2 1 A( B C D