Singular Points of Reducible Sextic Curves

Figure 18

𝑎=1; 𝑏=3/2, 2, 5/2, 3, 7/2, 4, 9/2, 5, 11/2, 6, 13/2, 7, 8 and 𝑎=2; 𝑏=5/2, 3, 7/2, 4, 9/2, 5, 11/2, 6, 13/2 and 𝑎=3; 𝑏=4.