Not under you PER se...
The Big Bang Theory Season 2, Episode 19
of 4.6 yoctometers
PER femtosecond.
The Big Bang Theory Season 5, Episode 18
Now, after that, PER pages three
and four, after you say:
Breaking Bad Season 4, Episode 4
Six toes PER foot
or six toes total?
The Big Bang Theory Season 12, Episode 20
Eighteen parts PER million.
The Big Bang Theory Season 8, Episode 9