Crossword puzzle clue "it comes in a case"

First comes love, then comes these two

First comes love, then comes these three

Alt.country singer Case whose "The Worse Things Get, The Harder I Fight, The Harder I Fight, The More I Love You" comes out tomorrow

It comes in a case

They work on a case-by-case basis

Something done on a case-by-case basis?

Ones working on a case-by-case basis?: Abbr.

___ case-by-case basis