Starting with polynomial:
P : t
Extension levels are: 1 4
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Trying to find an order 4 Kronrod extension for:
P1 : t
Solvable: 1
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Ending with final polynomial:
P : t^5 - 10/9*t^3 + 5/21*t
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Computing nodes and weights
  current precision for roots: 53
  current precision for roots: 106
 current precision for weights: 53
Linear system for weights solvable: 1
  current precision for roots: 106
  current precision for roots: 212
 current precision for weights: 106
Linear system for weights solvable: 1
Sufficient bits for target precision reached
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The nodes are:
| (0.53846931010568309104 - 2.3656081334167690636e-78j)  +/-  (2.37e-63, 2.37e-63j)
| (-0.53846931010568309104 - 1.5133754590909123358e-83j)  +/-  (2.37e-63, 2.37e-63j)
| (-0.9061798459386639928 + 2.0788133335218195196e-93j)  +/-  (2.89e-63, 2.89e-63j)
| (0 + 0j)  +/-  (0, 0j)
| (0.9061798459386639928 - 2.8853058180580424315e-129j)  +/-  (3.68e-63, 3.68e-63j)
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The weights are:
| (0.47862867049936646804 + 8.58637093296843641e-79j)  +/-  (7.84e-30, 6.86e-61j)
| (0.47862867049936646804 + 1.0513523601501313549e-78j)  +/-  (3.42e-30, 2.95e-61j)
| (0.23692688505618908751 - 2.7674714903049639465e-79j)  +/-  (1.47e-30, 1.18e-61j)
| (0.56888888888888888889 - 2.7204919178361368262e-78j)  +/-  (1.92e-30, 2.09e-61j)
| (0.23692688505618908751 + 1.0872496134196582249e-78j)  +/-  (9.84e-31, 6.41e-62j)
