In the realm of numbers, behold the three,
An oddity among the even, a lone entity,
Unfair and unyielding, it stands tall,
A trio, with a duo and one in thrall.
I am the extra, never part of the pair,
Always on the side, solitarily, in despair,
The power of three, a force to behold,
Capable of breaking, a story untold
I'm the extra in the duo.