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Primary legislative act of Ukraine — this is such a national legislative act
(Constitution of Ukraine,
Code of Ukraine,
Law of Ukraine,
Decree of the Cabinet of Ministers of Ukraine
during the period of powers that allowed him to perform legislative functions etc.),
which has an independent "primary" text, and which may be modified, if it necessary.
The law on amendments does not have to such an independent text, it can only change one or more primary laws.