{ diff(x1, t) = ((-1)*2*k2*k74/(2*k3)*x2/k4*x1/k5/((1 + k74/(2*k3) + x5/k6)*(1 + x2/k4 + x4/k7)*(1 + x1/k5 + x3/k8)) + (-1)*k30*(x10*x1 - k75*x3/k31)/(k32*k33)/((1 + x10/k33 + k75/k34)*(1 + x1/k32 + x3/k35)) + 1*k65*(x3/(x1*k66))^k67/(1 + (x3/(x1*k66))^k67))/k1,
  diff(x2, t) = ((-1)*2*k2*k74/(2*k3)*x2/k4*x1/k5/((1 + k74/(2*k3) + x5/k6)*(1 + x2/k4 + x4/k7)*(1 + x1/k5 + x3/k8)) + 1*k9*(x5*x4 - k73*x2/k10)/(k11*k12)/((1 + x5/k11 + k73/k13)*(1 + x4/k12 + x2/k14)) + (-1)*k15*x5/k16*x2/k17*x7/k18*x2/(x2 + k19*x4)/((1 + x5/k16)*(1 + x2/k17 + x4/k20)*(1 + x7/k18 + x9/k21)) + 1*k36*(x9*x4 - x7*x2*x12/k37)/(k38*k39)/((1 + x2/k40 + x4/k39)*(1 + x9/k38 + x7/k41)*(1 + x12/k42)) + 1*k43*(x12*x4 - k76*x2/k44)/(k45*k46)/((1 + x2/k47 + x4/k46)*(1 + x12/k45 + k76/k48)) + 1*k59*(x15*x4 - k78*x2/k60)/(k61*k62)/((1 + x15/k61 + k78/k63)*(1 + x4/k62 + x2/k64)) + 1*k68*x4*k79/(k69*k70)/((1 + x4/k69 + x2/k71)*(1 + k79/k70)))/k1,
  diff(x3, t) = (1*2*k2*k74/(2*k3)*x2/k4*x1/k5/((1 + k74/(2*k3) + x5/k6)*(1 + x2/k4 + x4/k7)*(1 + x1/k5 + x3/k8)) + 1*k30*(x10*x1 - k75*x3/k31)/(k32*k33)/((1 + x10/k33 + k75/k34)*(1 + x1/k32 + x3/k35)) + (-1)*k65*(x3/(x1*k66))^k67/(1 + (x3/(x1*k66))^k67))/k1,
  diff(x4, t) = (1*2*k2*k74/(2*k3)*x2/k4*x1/k5/((1 + k74/(2*k3) + x5/k6)*(1 + x2/k4 + x4/k7)*(1 + x1/k5 + x3/k8)) + (-1)*k9*(x5*x4 - k73*x2/k10)/(k11*k12)/((1 + x5/k11 + k73/k13)*(1 + x4/k12 + x2/k14)) + 1*k15*x5/k16*x2/k17*x7/k18*x2/(x2 + k19*x4)/((1 + x5/k16)*(1 + x2/k17 + x4/k20)*(1 + x7/k18 + x9/k21)) + (-1)*k36*(x9*x4 - x7*x2*x12/k37)/(k38*k39)/((1 + x2/k40 + x4/k39)*(1 + x9/k38 + x7/k41)*(1 + x12/k42)) + (-1)*k43*(x12*x4 - k76*x2/k44)/(k45*k46)/((1 + x2/k47 + x4/k46)*(1 + x12/k45 + k76/k48)) + (-1)*k59*(x15*x4 - k78*x2/k60)/(k61*k62)/((1 + x15/k61 + k78/k63)*(1 + x4/k62 + x2/k64)) + (-1)*k68*x4*k79/(k69*k70)/((1 + x4/k69 + x2/k71)*(1 + k79/k70)))/k1,
  diff(x5, t) = (1*2*k2*k74/(2*k3)*x2/k4*x1/k5/((1 + k74/(2*k3) + x5/k6)*(1 + x2/k4 + x4/k7)*(1 + x1/k5 + x3/k8)) + (-1)*k9*(x5*x4 - k73*x2/k10)/(k11*k12)/((1 + x5/k11 + k73/k13)*(1 + x4/k12 + x2/k14)) + (-1)*k15*x5/k16*x2/k17*x7/k18*x2/(x2 + k19*x4)/((1 + x5/k16)*(1 + x2/k17 + x4/k20)*(1 + x7/k18 + x9/k21)) + (-2)*k49*x5/k50*(1 - x14/(x5*k51))*(x5/k50 + x14/k52)^(k53 - 1)/(1 + (x5/k50 + x14/k52)^k53))/k1,
  diff(x6, t) = 0,
  diff(x7, t) = ((-1)*k15*x5/k16*x2/k17*x7/k18*x2/(x2 + k19*x4)/((1 + x5/k16)*(1 + x2/k17 + x4/k20)*(1 + x7/k18 + x9/k21)) + 1*k22*(x9*k80 - x10*x7/k23)/(k24*k25)/(1 + x9/k24 + k80/k26 + x10/k27 + x7/k28 + x9*k80/(k24*k25) + x10*x7/(k29*k28)) + 1*k36*(x9*x4 - x7*x2*x12/k37)/(k38*k39)/((1 + x2/k40 + x4/k39)*(1 + x9/k38 + x7/k41)*(1 + x12/k42)))/k1,
  diff(x8, t) = 0,
  diff(x9, t) = (1*k15*x5/k16*x2/k17*x7/k18*x2/(x2 + k19*x4)/((1 + x5/k16)*(1 + x2/k17 + x4/k20)*(1 + x7/k18 + x9/k21)) + (-1)*k22*(x9*k80 - x10*x7/k23)/(k24*k25)/(1 + x9/k24 + k80/k26 + x10/k27 + x7/k28 + x9*k80/(k24*k25) + x10*x7/(k29*k28)) + (-1)*k36*(x9*x4 - x7*x2*x12/k37)/(k38*k39)/((1 + x2/k40 + x4/k39)*(1 + x9/k38 + x7/k41)*(1 + x12/k42)))/k1,
  diff(x10, t) = (1*k22*(x9*k80 - x10*x7/k23)/(k24*k25)/(1 + x9/k24 + k80/k26 + x10/k27 + x7/k28 + x9*k80/(k24*k25) + x10*x7/(k29*k28)) + (-1)*k30*(x10*x1 - k75*x3/k31)/(k32*k33)/((1 + x10/k33 + k75/k34)*(1 + x1/k32 + x3/k35)))/k1,
  diff(x11, t) = 0,
  diff(x12, t) = (1*k36*(x9*x4 - x7*x2*x12/k37)/(k38*k39)/((1 + x2/k40 + x4/k39)*(1 + x9/k38 + x7/k41)*(1 + x12/k42)) + (-1)*k43*(x12*x4 - k76*x2/k44)/(k45*k46)/((1 + x2/k47 + x4/k46)*(1 + x12/k45 + k76/k48)))/k1,
  diff(x13, t) = 0,
  diff(x14, t) = (1*k49*x5/k50*(1 - x14/(x5*k51))*(x5/k50 + x14/k52)^(k53 - 1)/(1 + (x5/k50 + x14/k52)^k53) + (-1)*k54*x14/k55/(1 + x14/k55 + x15/k56) + (-1)*k72*x14)/k1,
  diff(x15, t) = (1*k54*x14/k55/(1 + x14/k55 + x15/k56) + (-1)*k57*x15/k58/(1 + x15/k58) + (-1)*k59*(x15*x4 - k78*x2/k60)/(k61*k62)/((1 + x15/k61 + k78/k63)*(1 + x4/k62 + x2/k64)) + 1*k72*x14)/k1,
  diff(x16, t) = 0,
  diff(x17, t) = 0,
  diff(x18, t) = 0,
  diff(x19, t) = 0 }