![Eighteen parts per million.
Eighteen parts per million.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Eighteen parts PER million.
The Big Bang Theory Season 8, Episode 9
![of 4.6 yoctometers
per femtosecond.
of 4.6 yoctometers
per femtosecond.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
of 4.6 yoctometers
PER femtosecond.
The Big Bang Theory Season 5, Episode 18
![Look, what was the price per head
last time? I'll triple it.
Look, what was the price per head
last time? I'll triple it.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Look, what was the price PER head
last time? I'll triple it.
Breaking Bad Season 5, Episode 13
![200 million euros printed per day.
200 million euros printed per day.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
200 million euros printed PER day.
Money Heist Season 1, Episode 8
![Based on the number of chirps
per minute and the temperature...
Based on the number of chirps
per minute and the temperature...](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Based on the number of chirps
PER minute and the temPERature...
The Big Bang Theory Season 3, Episode 2