5-3-2 Set-Reps On One Lift a Day?

So, I am following the One Lift a Day program right now. I am on week two right now, 6x3, but next week the program calls for a 5-3-2 set rep scheme.

Can anyone explain what kind of protocol that is?

work up to a double in three sets. Heavy 5 heavy 3 and heavy 2. As heavy as possible.

-chris

Awesome, thanks.