Luke 6:1

δευτερόπρωτος is a word unknown to scholars. It is two words compounded into one second + first. As the author, Luke, is coining a new word (hapax legomenon). The unique word was commented on by Chrysostom and Epiphanius who lived in the 4th and 5th centuries.

A simple logic of the word is that cessation/sabbath is a joining of the first and second. Such a sense however would never fit into any calendric, sequential, or time-series logic, and thus such logic would never be possible to find.

Entering into the Sabbath Rest therefore can be seen as a dual act, from two sides, and thus a second-first cessation. When both sides cease, or find rest.