On the contrary I’m always confused with these names, especially when sites refer by name only or year only. Bionic <-> 16, 18, 20? No clue. Focal minus Bionic

On the contrary I’m always confused with these names, especially when sites refer by name only or year only. Bionic <-> 16, 18, 20? No clue. Focal minus Bionic is 4. Are these separated by one, two or four years? No idea, always have to google it.