example6 := (-68+63*x-40*y+28*x*y+61*x^2*y+57*x*y^2+83*x^5*y-8*x^4*y^2-54*x^4* y+96*x^3*y^3-51*x^3*y^2+89*x^3*y-79*x^2*y^4-58*x^2*y^3-95*x^2*y^2+86*x*y^5+57* x*y^4-35*x*y^3-2*x^2+72*y^2+14*x^3-34*y^3-96*x^5+62*x^4-66*y^4-71*y^5+21*y^6-\ 14*x^6)/(66+90*y-48*x*y-49*x^2*y+38*x*y^2-32*x^5*y+87*x^4*y^2-60*x^4*y-61*x^3* y^3+45*x^3*y^2-50*x^3*y+48*x^2*y^4-82*x^2*y^3+46*x^2*y^2+18*x*y^5+16*x*y^4-22* x*y^3-66*x^2-31*y^2-22*x^3-63*y^3+17*x^5+7*x^4-87*y^4-13*y^5-87*y^6-15*x^6)* exp((88*x+74*y-39)/(-20*x+31*y-52));