The IFS equations are as follows
yn+1 = c xn + d yn + f
set 1 set 2 a 0.2020 0.1380 b -0.8050 0.6650 c -0.6890 -0.5020 d -0.3420 -0.2220 e -0.3730 0.6600 f -0.6530 -0.2770