{ diff(x1, t) = ((-1)*k44*(k2*x1*x3 - k1*x2) + (-1)*k44*(k4*x1*x5 - k3*x4))/k44,
  diff(x2, t) = 1*k44*(k2*x1*x3 - k1*x2)/k44,
  diff(x3, t) = ((-1)*k44*(k2*x1*x3 - k1*x2) + (-1)*k44*k5*x4*x3 + (-1)*k44*k6*x6*x3 + (-1)*k44*k7*x7*x3)/k44,
  diff(x4, t) = (1*k44*(k4*x1*x5 - k3*x4) + (-1)*k44*(k9*x4*x9 - k8*x8) + (-1)*k44*(k12*x4*x6 - k11*x10) + (-1)*k44*(k14*x4*x11 - k13*x12) + (-1)*k44*k37*x4*x27 + (-1)*k44*k42*x4*x29 + 1*k44*k15*x12)/k44,
  diff(x5, t) = ((-1)*k44*(k4*x1*x5 - k3*x4) + 1*k44*k5*x4*x3 + 1*k44*k6*x6*x3 + 1*k44*k7*x7*x3)/k44,
  diff(x6, t) = ((-1)*k44*(k12*x4*x6 - k11*x10) + (-1)*k44*(k28*x6*x22 - k27*x23) + (-1)*k44*(k34*x6*x26 - k33*x27) + (-1)*k44*k38*x6*x29 + 1*k44*k22*x18)/k44,
  diff(x7, t) = (1*k44*k16*x6*x14 + 1*k44*k32*x25*x23 + (-1)*k44*k41*x7*x29)/k44,
  diff(x8, t) = (1*k44*(k9*x4*x9 - k8*x8) + (-1)*k44*k10*x8)/k44,
  diff(x9, t) = ((-1)*k44*(k9*x4*x9 - k8*x8) + (-1)*k44*(k21*x17*x9 - k20*x18) + 1*k44*k25*x18)/k44,
  diff(x10, t) = (1*k44*(k12*x4*x6 - k11*x10) + (-1)*k44*(k36*x10*x26 - k35*x28) + 1*k44*k10*x8)/k44,
  diff(x11, t) = (-1)*k44*(k14*x4*x11 - k13*x12)/k44,
  diff(x12, t) = (1*k44*(k14*x4*x11 - k13*x12) + (-1)*k44*k15*x12)/k44,
  diff(x13, t) = ((-1)*k44*(k19*x13*x16 - k18*x17) + 1*k44*k25*x18 + 1*k44*k25*x17 + (-1)*k44*k40*x13*x29 + 1*k44*k15*x12)/k44,
  diff(x14, t) = ((-1)*k44*k16*x6*x14 + (-1)*k44*(k30*x23*x14 - k29*x24))/k44,
  diff(x15, t) = (-1)*k44*k17*x7*x15/k44,
  diff(x16, t) = (1*k44*k17*x7*x15 + (-1)*k44*(k19*x13*x16 - k18*x17) + (-1)*k44*(k24*x16 - k23*x19*x20))/k44,
  diff(x17, t) = (1*k44*(k19*x13*x16 - k18*x17) + (-1)*k44*(k21*x17*x9 - k20*x18) + (-1)*k44*k25*x17 + 1*k44*k22*x18)/k44,
  diff(x18, t) = (1*k44*(k21*x17*x9 - k20*x18) + (-1)*k44*k25*x18 + (-1)*k44*k22*x18)/k44,
  diff(x19, t) = (1*k44*(k24*x16 - k23*x19*x20) + 1*k44*k25*x18 + 1*k44*k25*x17)/k44,
  diff(x20, t) = (1*k44*(k24*x16 - k23*x19*x20) + 1*k44*k25*x18 + 1*k44*k25*x17)/k44,
  diff(x21, t) = (-1)*k44*k26*x7*x21/k44,
  diff(x22, t) = (1*k44*k26*x7*x21 + (-1)*k44*(k28*x6*x22 - k27*x23))/k44,
  diff(x23, t) = (1*k44*(k28*x6*x22 - k27*x23) + (-1)*k44*(k30*x23*x14 - k29*x24) + 1*k44*k31*x24)/k44,
  diff(x24, t) = (1*k44*(k30*x23*x14 - k29*x24) + (-1)*k44*k31*x24)/k44,
  diff(x25, t) = ((-1)*k44*k32*x25*x23 + (-1)*k44*k39*x25*x29 + 1*k44*k31*x24)/k44,
  diff(x26, t) = ((-1)*k44*(k34*x6*x26 - k33*x27) + (-1)*k44*(k36*x10*x26 - k35*x28))/k44,
  diff(x27, t) = (1*k44*(k34*x6*x26 - k33*x27) + (-1)*k44*k37*x4*x27)/k44,
  diff(x28, t) = (1*k44*(k36*x10*x26 - k35*x28) + 1*k44*k37*x4*x27)/k44,
  diff(x29, t) = ((-1)*k44*k38*x6*x29 + (-1)*k44*k39*x25*x29 + (-1)*k44*k40*x13*x29 + (-1)*k44*k41*x7*x29 + (-1)*k44*k42*x4*x29)/k44,
  diff(x30, t) = 1*k44*k38*x6*x29/k44,
  diff(x31, t) = 1*k44*k39*x25*x29/k44,
  diff(x32, t) = 1*k44*k40*x13*x29/k44,
  diff(x33, t) = 1*k44*k41*x7*x29/k44,
  diff(x34, t) = 1*k44*k42*x4*x29/k44 }