I want to buy the Valve Complete Pack, BUT...

I have a doubt. I have half of the games of the pack, and when I want to buy it, it says:
"According to our records, you already own one or more of the items included in this package on Steam. If purchasing for yourself, see the Extra Copies support article to determine whether the items you already own can be shared with friends."
To speak clearly, the games I have from the pack are: Half-Life, Counter Strike, Ricochet, Deathmatch Classic, Day of Defeat, HL: Blue Shift, HL: Opposing Force, HL 2 Episode 1, Portal, Portal 2, and Left 4 Dead 2.
SO, I want the pack, it has a lot of games that I want (HL2, Ep2, CS:GO, L4D, HL Source, etc), BUT I don't want to pay the full price and get just the half of the games because Gaben is greedy and doesn't want to give extra copies. I want to know for what games I'm going to have an extra copy.
I know, some of you probably will say something like "Hey, but it's a discount, those games worth more than $18, even if they are not all". I know, but my money is worth the same as anyone who doesn't have half of the games, so it's not fair that I get half of the games, if it's going to be like that, just charge me the half of the price...
Please, help? :3
EDIT: ALSO I forgot to say, that article it's not really clear to me, so I'm asking here because you probably know better

TL;DR: I have half of the games of the pack, for what of those games I'm gonna have an extra giftable copy?