Rut? I think you mean CONSISTENCY.
The Big Bang Theory Season 2, Episode 20
You know of the four of us,
you have the most veal-like CONSISTENCY.
The Big Bang Theory Season 8, Episode 21
In an ever-changing world,
it is a single point of CONSISTENCY.
The Big Bang Theory Season 2, Episode 16
At best you can say, "Hey, look, my idea
has an internal logical CONSISTENCY."
The Big Bang Theory Season 1, Episode 3
and don't even ask about the
CONSISTENCY of my bowel movements.
The Big Bang Theory Season 10, Episode 7