The OXYGEN comes first.
Money Heist Season 3, Episode 3
Let's get him 2 grams of OXYGEN.
Breaking Bad Season 3, Episode 8
WALT:
Nitrogen bonds to OXYGEN,
which in turn...
Breaking Bad Season 2, Episode 7
because you're using up your OXYGEN,
Money Heist Season 3, Episode 6
That would maximize OXYGEN
for optimal combustion.
The Big Bang Theory Season 9, Episode 20