Nearly everything in life goes in threes and fours.
Because there are no fours.
He raped me ... he fondled me, he put me on all fours, and had sex with me,
And so it continued all day, wynde after wynde, From a room beyond came the whistle of a teakettle. Now, you really must join me. I've some marvelous Darjeeling, and some delicious petit fours a friend of mine gave me for Christmas.
The only intelligent way to discuss politics is on all fours.