{ diff(x1, t) = (1*k42*13*piecewise(k14*piecewise(0, and(k71*1/2*k18*x7 = 0, k72*(x22 + k15) = 0), 2*k72*(x22 + k15)*k78/k14/(k71*1/2*k18*x7 - k72*(x22 + k15) + k71*1/2*k18*x7*k77/k14 + k72*(x22 + k15)*k78/k14 + sqrt((k71*1/2*k18*x7 - k72*(x22 + k15) + k71*1/2*k18*x7*k77/k14 + k72*(x22 + k15)*k78/k14)^2 - 4*(k71*1/2*k18*x7 - k72*(x22 + k15))*k72*(x22 + k15)*k78/k14)))/k14, k20 = 1, 1) + (-1)*k56*x1 + (-1)*k74*x2*x1)/k95,
  diff(x2, t) = (1*k11*k16*(x12 - x3 - x4 - x5 - x2)*(x1 - x2) + (-1)*k11*k17*x2)/k95,
  diff(x3, t) = (1*k11*k16*(x12 - x3 - x4 - x5 - x2)*(k12 - x3 - k18*x6) + (-1)*k11*k17*x3)/k95,
  diff(x4, t) = (1*k11*k16*(x12 - x3 - x4 - x5 - x2)*(x13 - x4) + (-1)*k11*k17*x4)/k95,
  diff(x5, t) = (1*k11*k16*(x12 - x3 - x4 - x5 - x2)*(k13 - x5 - k18*x7) + (-1)*k17*k11*x5)/k95,
  diff(x6, t) = (1*k11*k94*(k12 - x3 - k18*x6)^k18 + (-1)*k11*k17*x6)/k95,
  diff(x7, t) = (1*k11*k94*piecewise(x1 - x2, k75 = 1, 1)*(k13 - x5 - k18*x7)^k18 + (-1)*k11*k17*x7/(1 + k21*(x1 - x2)))/k95,
  diff(x8, t) = (1*k37*(k22 + k30*x15)/(k24 + k22 + k30*x15) + (-1)*k50*x8 + (-1)*1/2*k35*(x8 + 1/2*k18*x6 + k36 - sqrt((x8 + 1/2*k18*x6 + k36)^2 - 4*x8*1/2*k18*x6)))/k96,
  diff(x9, t) = (1*1/2*k35*(x8 + 1/2*k18*x6 + k36 - sqrt((x8 + 1/2*k18*x6 + k36)^2 - 4*x8*1/2*k18*x6)) + (-1)*k51*x9)/k96,
  diff(x10, t) = (1*k43*x9 + (-1)*k57*x10)/k96,
  diff(x11, t) = (1*k38*(k23 + k29*x10 + k31*x15)/(k25 + k23 + k29*x10 + k31*x15) + (-1)*k52*x11)/k96,
  diff(x12, t) = (1*k44*x11 + (-1)*k58*x12)/k95,
  diff(x13, t) = (1*k45*k66 + (-1)*k59*x13 + (-1)*k69*(x13 - x4) + (-1)*k73*x17*x13)/k95,
  diff(x14, t) = (1*k69*(x13 - x4) + (-1)*k60*x14 + (-1)*k70*x14)/k97,
  diff(x15, t) = (1*k70*x14 + (-1)*k61*x15)/k96,
  diff(x16, t) = (1*k39*x15/(k26 + x15) + (-1)*k53*x16)/k96,
  diff(x17, t) = (1*k46*x16 + (-1)*k62*x17)/k95,
  diff(x18, t) = (1*k47*k68/(1 + (k14*piecewise(0, and(k71*1/2*k18*x7 = 0, k72*(x22 + k15) = 0), 2*k72*(x22 + k15)*k78/k14/(k71*1/2*k18*x7 - k72*(x22 + k15) + k71*1/2*k18*x7*k77/k14 + k72*(x22 + k15)*k78/k14 + sqrt((k71*1/2*k18*x7 - k72*(x22 + k15) + k71*1/2*k18*x7*k77/k14 + k72*(x22 + k15)*k78/k14)^2 - 4*(k71*1/2*k18*x7 - k72*(x22 + k15))*k72*(x22 + k15)*k78/k14)))/k76)^k19) + (-1)*k63*x18)/k96,
  diff(x19, t) = (1*k40*(k32*x18 + k34*x15)/(k27 + k32*x18 + k34*x15) + (-1)*k54*x19)/k96,
  diff(x20, t) = (1*k48*x19 + (-1)*k64*x20)/k96,
  diff(x21, t) = (1*k41*k33*x20/(k28 + k33*x20) + (-1)*k55*x21)/k96,
  diff(x22, t) = (1*k49*x21 + (-1)*k65*x22)/k96,
  diff(x23, t) = (1*k79/(1 + k81*x20) + (-1)*k80*x23)/k98,
  diff(x24, t) = (1*k84*k83 + 1*k85*(x25 - x27)*k83 + (-1)*k84*x24 + (-1)*k85*(x25 - x27)*x24 + (-1)*k86*x24)/k98,
  diff(x25, t) = (1*k89 + 1*k90*k82*x20 + (-1)*k91*x25)/k96,
  diff(x26, t) = (1*k87*(x24 - x26)*(x23 - x27 - x26) + (-1)*k88*x26 + (-1)*k86*x26)/k98,
  diff(x27, t) = (1*k92*(x25 - x27)*(x23 - x27 - x26) + (-1)*k93*x27 + (-1)*k91*x27)/k98 }