The key is the number
of hands PER hour.
Breaking Bad Season 4, Episode 4
...between the number of chirps PER
minute and the ambient temPERature.
The Big Bang Theory Season 3, Episode 2
Accelerating at an initial rate
of 32 feet PER second.
The Big Bang Theory Season 1, Episode 2
- -equals mass times
9.8 meters PER second PER second.
The Big Bang Theory Season 3, Episode 10
As PER your suggestion,
we're hanging out.
The Big Bang Theory Season 4, Episode 5