[ Eq(Derivative(x1, t), (1*k64*k8*k65**k62/(k65**k62 + x19**k62) + (-1)*k64*k10*x1 + (-1)*k64*k9*x1/(k21 + x1))/k64),
  Eq(Derivative(x2, t), (1*k64*k37*x1 + (-1)*k64*k38*x2/(k22 + x2) + (-1)*k64*(k40*x2 - k41*x4) + (-1)*k64*k16*x2 + 1*k64*k39*x3/(k23 + x3))/k64),
  Eq(Derivative(x3, t), (1*k64*k38*x2/(k22 + x2) + (-1)*k64*k16*x3 + (-1)*k64*k42*x3/(k26 + x3) + (-1)*k64*k39*x3/(k23 + x3))/k64),
  Eq(Derivative(x4, t), (1*k64*(k40*x2 - k41*x4) + (-1)*k64*(k33*x13*x4 - k34*x16) + (-1)*k64*k43*x4/(k22 + x4) + (-1)*k64*k16*x4 + 1*k64*k44*x14/(k23 + x14))/k64),
  Eq(Derivative(x5, t), (1*k64*k17*x6 + (-1)*k64*k18*x5/(k22 + x5) + (-1)*k64*(k15*x5*x9 - k14*x11) + (-1)*k64*k20*x5 + 1*k64*k19*x7/(k23 + x7))/k64),
  Eq(Derivative(x6, t), ((-1)*k64*k7*x6 + 1*k64*k5*x4**k63/(k58**k63 + x4**k63) + (-1)*k64*k6*x6/(k60 + x6))/k64),
  Eq(Derivative(x7, t), (1*k64*k18*x5/(k22 + x5) + (-1)*k64*k25*x7/(k26 + x7) + (-1)*k64*k16*x7 + (-1)*k64*k19*x7/(k23 + x7))/k64),
  Eq(Derivative(x8, t), (1*k64*(12/5 + (3 - 12/5)*ceiling(sin(pi*t/12 + 1/1000)/2))*x4**k63/(k57**k63 + x4**k63) + (-1)*k64*k4*x8 + (-1)*k64*k3*x8/(k59 + x8))/k64),
  Eq(Derivative(x9, t), (1*k64*k11*x8 + (-1)*k64*k12*x9/(k22 + x9) + (-1)*k64*(k15*x5*x9 - k14*x11) + (-1)*k64*k16*x9 + 1*k64*k13*x10/(k23 + x10))/k64),
  Eq(Derivative(x10, t), ((-1)*k64*k24*x10/(k26 + x10) + 1*k64*k12*x9/(k22 + x9) + (-1)*k64*k16*x10 + (-1)*k64*k13*x10/(k23 + x10))/k64),
  Eq(Derivative(x11, t), (1*k64*(k15*x5*x9 - k14*x11) + (-1)*k64*k27*x11/(k22 + x11) + (-1)*k64*(k30*x11 - k29*x13) + (-1)*k64*k16*x11 + 1*k64*k28*x12/(k23 + x12))/k64),
  Eq(Derivative(x12, t), (1*k64*k27*x11/(k22 + x11) + (-1)*k64*k35*x12/(k26 + x12) + (-1)*k64*k16*x12 + (-1)*k64*k28*x12/(k23 + x12))/k64),
  Eq(Derivative(x13, t), (1*k64*(k30*x11 - k29*x13) + (-1)*k64*k31*x13/(k22 + x13) + (-1)*k64*(k33*x13*x4 - k34*x16) + 1*k64*k32*x15/(k23 + x15) + (-1)*k64*k16*x13)/k64),
  Eq(Derivative(x14, t), ((-1)*k64*k16*x14 + 1*k64*k43*x4/(k22 + x4) + (-1)*k64*k45*x14/(k26 + x14) + (-1)*k64*k44*x14/(k23 + x14))/k64),
  Eq(Derivative(x15, t), ((-1)*k64*k16*x15 + 1*k64*k31*x13/(k22 + x13) + (-1)*k64*k36*x15/(k26 + x15) + (-1)*k64*k32*x15/(k23 + x15))/k64),
  Eq(Derivative(x16, t), (1*k64*(k33*x13*x4 - k34*x16) + (-1)*k64*k16*x16 + (-1)*k64*k46*x16/(k26 + x16))/k64),
  Eq(Derivative(x17, t), (1*k64*k47*x4**k61/(k48**k61 + x4**k61) + (-1)*k64*k51*x17 + (-1)*k64*k49*x17/(k50 + x17))/k64),
  Eq(Derivative(x18, t), (1*k64*k52*x17 + (-1)*k64*(k53*x18 - k54*x19) + (-1)*k64*k55*x18/(k26 + x18) + (-1)*k64*k16*x18)/k64),
  Eq(Derivative(x19, t), (1*k64*(k53*x18 - k54*x19) + (-1)*k64*k56*x19/(k26 + x19) + (-1)*k64*k16*x19)/k64) ]