Chyba:
HCl %2B SnCl2 %2B HNO2 %3D H2O %2B NO %2B SnCl4
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Neočakávaný ('%')HCl %2B SnCl2 %2B HNO2 %3D H2O %2B NO %2B SnCl4
^
Neočakávaný ('%')