What are the Elements of Ecclesiastical Law Vol 1 53-54?

Answer 1

Can. 53 If decrees are contrary one to another, where specific matters are expressed, the specific prevails over the general; if both are equally specific or equally general, the one later in time abrogates the earlier insofar as it is contrary to it.

Can. 54 §1 A singular decree whose application is entrusted to an executor, has effect from the moment of execution; otherwise, from the moment when it is made known to the person on the authority of the one who issued it.