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 implicitly or for an indeterminate period. Nor shall sub-delegation to authorities other than the Government itself be authorized.

4. Acts of basic principles shall define precisely the purpose and scope of legislative delegation, as well as the principles and criteria to be followed in its exercise.

5. Authorization for consolidating legal texts shall determine the legislative scope implicit in the delegation, specifying if it is restricted to the mere drafting of a single text or whether it includes regulating, clarifying and harmonizing the legal statutes to be consolidated.

6. The acts of delegation may provide for additional control devices in each case, without prejudice to the jurisdiction of the Courts.

Section 83

The acts of basic principles may in no case:

a) Authorise the modification of the act itself.

b) Grant power to enact retroactive regulations.

Section 84

In the event that a non-governmental bill or an amendment is contrary to a currently valid legislative delegation, the Government may oppose its processing. In this case, a non-governamental bill may be submitted for the total or partial repeal of the delegation act.

Section 85

Government provisions containing delegated legislation shall bear the title of «Legislative Decrees».

Section 86

1. In case of extraordinary and urgent need, the Government may issue temporary 42