[ Diff(x[1], t) = (1*k[15]*k[1] + (-1)*k[15]*k[2]*x[1] + 1*k[16]*4*k[3]*k[4]^k[5]*x[1]^k[5]/((x[1]^k[5] + k[4]^k[5])*(x[1]^k[5] + k[6]^k[5]))*x[3]^k[7]/(x[3]^k[7] + k[8]^k[7])*(x[2] - x[1]) + (-1)*k[15]*k[9]*x[1]^2/(x[1]^2 + k[10]^2) + 1*k[16]*k[11]*(x[2] - x[1]))/k[15],
  Diff(x[2], t) = ((-1)*k[16]*4*k[3]*k[4]^k[5]*x[1]^k[5]/((x[1]^k[5] + k[4]^k[5])*(x[1]^k[5] + k[6]^k[5]))*x[3]^k[7]/(x[3]^k[7] + k[8]^k[7])*(x[2] - x[1]) + 1*k[15]*k[9]*x[1]^2/(x[1]^2 + k[10]^2) + (-1)*k[16]*k[11]*(x[2] - x[1]))/k[16],
  Diff(x[3], t) = (1*k[15]*k[12]*x[1]^2/(x[1]^2 + k[13]^2) + (-1)*k[15]*k[14]*x[3])/k[15] ]