Are you not aware that we are never seen one without the others, and that we are called the three inseparables?
"The World's Greatest Books, Vol III"
Arthur Mee and J.A. Hammerton, Eds.
Known as the Three inseparables.
"Project Gutenberg, Deep Waters, by W.W. Jacobs"
W.W. Jacobs
We were inseparables,-hunting everywhere in couples.
"The Fatal Boots"
William Makepeace Thackeray