# possible stops: 4,5,6,7,8

flist=f^-1(x),-f^-1(x),f^-1(-x),-f^-1(-x),f(-x),-f(x),-f(-x),f(x)
xlist=f,      f,       -(f),    -(f),	  -t,   t,    -t,    t
ylist=t,      -t,      t,	-t,	  f,	-(f), -(f),  f

