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robimy od tyłu:
Pa²³⁵₉₁
Th²³⁵₉₀
U²³⁹₉₂
sprawdzamy
U²³⁹₉₂ ->[⁻⁴₋₂] Th²³⁵₉₀->[⁰₊₁]Pa²³⁵₉₁->[⁰₊₁]->U²³⁵₉₂