Logic Challenge (The three words answer has been revealed)

[Kevin]

:o maybe this is too hard xD . Actually the answer is very simple and very short xD (only a few simple words).
First hint is that the right-most item will lose one-third of its contains.
The ♦'s lost by a slot will be received by one of the slots in its left.
Slots with less ♦ usually receives more ♦ after the reaction.
Can you figure out some pattern from the given reactions with these clues? :P Maybe at first you will get a complicated pattern, but maybe you will be able to simplify it.