
but it looks like
an immensely COMPLEX
encryption key.
Westworld Season 2, Episode 3

...about a minor league engineer
with an unresolved Oedipal COMPLEX.
The Big Bang Theory Season 4, Episode 7

but by using a computer to solve
COMPLEX mathematical problems.
The Big Bang Theory Season 11, Episode 9

a massive inferiority COMPLEX.
The Big Bang Theory Season 11, Episode 15

Leonard, you will be doing a series
of COMPLEX mathematical problems...
The Big Bang Theory Season 2, Episode 23