Trios have become part of our systemic culture: the holy trinity ("God's sake"), the triangle is the strongest architectural shape, catastrophes happen in threes, we chunk information in threes (recite a phone number - it comes out in 3 numeric segments), most common folk-speak phrases are three words long, etc.
Don't fret, Saxon; and don't battle 2000 years of cultural indoctrination.
Do you have 3 safes yet?