proof              {
  reset=1960 type=formula  formulaname=formula4
  passes=1 center-mag=0.455159/-2.25494/1.104221 float=y maxiter=26
  inside=bof60
  colors=000z00<49>zy0zz0yz0<48>1z00z00z1<48>0zy0zz0yz<48>01z00z10z<48>y0z
  }
frm:formula4 {; Giuseppe Zito
 z = pixel ,
c0 = 0.49834201
  : 
 x = real(z), y = imag(z)
s0 =c0
s0 = s0 -y
s0 = s0 /y
s0 = s0 /y
s0 = s0 -x
newx = s0 
s0 = y
s0 = s0 +x
newy = s0 
z = newx + flip(newy)
 newx < 4 && newx > -4 && newy < 4 && newy > -4 
}