In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

He has been on the Chrysanthemum Throne since his father Akihito abdicated in 2019 .
He acceded to the Chrysanthemum Throne upon the abdication of his father , the now-Emperor Emeritus Akihito on 1 May 2019 at 00:00 local time ( 15:00 UTC ) .

A running gag is an humorous joke or reference that is used several times in a work or series of works .
A running gag , or running joke , is a literary device that takes the form of an amusing joke or a comical reference and appears repeatedly throughout a work of literature or other form of storytelling .

In computer security , Arbitrary Code Execution is something that allows executing code without permission .

In computer security , arbitrary code execution ( ACE ) is used to describe an attacker 's ability to execute arbitrary commands or code on a target machine or in a target process .