m = 0.1 (slider from 0 to 1.8, step 0.1)
n = 1 (slider from -5 to 5, step 0.1)
e = 3 (slider from -5 to 5, step 0.2)
k = 2 (slider from 0 to 10, step 0.5)
b: k^(4) + (((e^(2) * (m - n)) * (m + n)) - (((2 * e) * (m^(2) + n^(2))) * x) + (((m - n) * (m + n)) * (x^(2) + y^(2))))^(2) - ((2 * k^(2)) * ((e^(2) * (m^(2) + n^(2))) + (((2 * e) * ((-m^(2)) + n^(2))) * x) + ((m^(2) + n^(2)) * (x^(2) + y^(2))))) = 0
a: k^(4) + ((((-2 * e) * (m^(2) + n^(2))) * x) + ((m^(2) - n^(2)) * (e^(2) + x^(2) + y^(2))))^(2) - ((2 * k^(2)) * ((((-2 * e) * (m^(2) - n^(2))) * x) + ((m^(2) + n^(2)) * (e^(2) + x^(2) + y^(2))))) = 0
c: k^(4) + ((((-2 * e) * (1 + n^(2))) * x) + ((1 - n^(2)) * (e^(2) + x^(2) + y^(2))))^(2) - ((2 * k^(2)) * ((((-2 * e) * (1 - n^(2))) * x) + ((1 + n^(2)) * (e^(2) + x^(2) + y^(2))))) = 0