{ diff(x1, t) = (1*x2*x23*k28 + (-1)*x1*k27)/k57,
  diff(x2, t) = ((-1)*x2*x23*k28 + 1*x1*k27)/k57,
  diff(x3, t) = 1*(x13*k35 - x3*k36)/k57,
  diff(x4, t) = 1*(k37*x3 - k38*x4)/k57,
  diff(x5, t) = (1*(k55 - x5)*k39 + (-1)*(x5*k56*k40 - x6*k41) + (-1)*x5*x12*k45 + 1*x7*k46)/k57,
  diff(x6, t) = (1*(x5*k56*k40 - x6*k41) + (-1)*x6*k42 + (-1)*x6*x12*k43 + 1*x8*k44)/k57,
  diff(x7, t) = (1*x5*x12*k45 + (-1)*x7*k46 + (-1)*x7*k47 + (-1)*(x7*k56*k48 - x8*k49))/k57,
  diff(x8, t) = (1*x6*x12*k43 + (-1)*x8*k44 + 1*(x7*k56*k48 - x8*k49) + (-1)*x8*k50)/k57,
  diff(x9, t) = ((-1)*x6*x9*k51 + 1*x10*k52)/k57,
  diff(x10, t) = (1*x6*x9*k51 + (-1)*x10*k52)/k57,
  diff(x11, t) = ((-1)*x11*x10*k53 + 1*x12*k54)/k57,
  diff(x12, t) = (1*x11*x10*k53 + (-1)*x12*k54)/k57,
  diff(x13, t) = ((-1)*x10*x13*k33 + 1*x14*k34)/k57,
  diff(x14, t) = (1*x10*x13*k33 + (-1)*x14*k34)/k57,
  diff(x15, t) = (-1)*(k21*x15/k22 - k21*x18/k22)/(1 + x15/k22 + x18/k22)/k58,
  diff(x16, t) = (-1)*(k1*x16/k2 - k1*x23/k2)/(1 + x16/k2 + x23/k2)/k58,
  diff(x17, t) = (1*((1 + k29*x10)*k3*x23/k4 - k5*x17/k6)/(1 + x23/k4 + x17/k6) + (-1)*k7*x17/(k8 + x17) + 1*(1 + k31*x4)*k11*x20/(k12 + x20))/k59,
  diff(x18, t) = (1*k7*x17/(k8 + x17) + (-1)*(k13*x18/k14 - k15*x19/k16)/(1 + x18/k14 + x19/k16) + 1*(k21*x15/k22 - k21*x18/k22)/(1 + x15/k22 + x18/k22) + (-1)*k9*x18/(k10 + x18))/k59,
  diff(x19, t) = 1*(k13*x18/k14 - k15*x19/k16)/(1 + x18/k14 + x19/k16)/k59,
  diff(x20, t) = (1*k9*x18/(k10 + x18) + (-1)*(1 + k31*x4)*k11*x20/(k12 + x20))/k59,
  diff(x21, t) = 1*(k23*x22/k24 - (1 + k30*x2)*k25*x21/k26)/(1 + x22/k24 + x21/k26)/k59,
  diff(x22, t) = (1*((1 + k32*x10)*k17*x23/k18 - k19*x22/k20)/(1 + x23/k18 + x22/k20) + (-1)*(k23*x22/k24 - (1 + k30*x2)*k25*x21/k26)/(1 + x22/k24 + x21/k26))/k59,
  diff(x23, t) = (1*(k1*x16/k2 - k1*x23/k2)/(1 + x16/k2 + x23/k2) + (-1)*((1 + k29*x10)*k3*x23/k4 - k5*x17/k6)/(1 + x23/k4 + x17/k6) + (-1)*((1 + k32*x10)*k17*x23/k18 - k19*x22/k20)/(1 + x23/k18 + x22/k20))/k59 }