You can't. If you were to PREVENT yourself
from buying it in the past...
The Big Bang Theory Season 1, Episode 14
Wolverine's never displayed interest
in helping others PREVENT prostate cancer.
The Big Bang Theory Season 4, Episode 9
And if something were to PREVENT you from
doing your laundry on Saturday at 8:15...
The Big Bang Theory Season 2, Episode 7
{\i1}...to PREVENT a death.{\i0}
Money Heist Season 3, Episode 6
"swear fealty to King Joffrey,
and PREVENT any strife
Game of Thrones Season 7, Episode 6