Full Idea
While it might be true that for all x, if Ax then Bx, would we really want to count it as a genuine regularity in nature if only five things were A (and all five were also B)?
Gist of Idea
Would it count as a regularity if the only five As were also B?
Source
Stephen Mumford (Laws in Nature [2004], 03.3)
Book Reference
Mumford,Stephen: 'Laws in Nature' [Routledge 2006], p.39