The OXYGEN comes first.
Money Heist Season 3, Episode 3
It feels as if there wasn’t enough OXYGEN.
Money Heist Season 1, Episode 8
That would maximize OXYGEN
for optimal combustion.
The Big Bang Theory Season 9, Episode 20
{\i1}To confront them, we only needed OXYGEN.{\i0}
Money Heist Season 3, Episode 6
they theoretically can separate
the hydrogen from the OXYGEN,
Breaking Bad Season 2, Episode 12