T0a dual orientation on 200 Delaunay triangulations: PASS
T0b digon (Hopf link)            components 2 (expected 2), tau 2 (expected 2), euler 2: PASS
T0b triangle (trefoil)           components 1 (expected 1), tau 3 (expected 3), euler 2: PASS
T0b theta (trefoil)              components 1 (expected 1), tau 3 (expected 3), euler 2: PASS
T0b 4-cycle (T(2,4))             components 2 (expected 2), tau 4 (expected 4), euler 2: PASS
T0b path of 2 edges (unknot)     components 1 (expected 1), tau 1 (expected 1), euler 2: PASS
T0b W3 = K4 (Borromean rings)    components 3 (expected 3), tau 16 (expected 16), euler 2: PASS
T0b W4 (8_18)                    components 1 (expected 1), tau 45 (expected 45), euler 2: PASS
T0c pairs of 400 random series-parallel networks = (Kirchhoff tau(N), tau(N/st)): PASS
T0d Kirchhoff mod p = exact on 100 maps: PASS
