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a few days ago, i bought call of duty 4 off ebay and i just got it today.  my question is with the multiplayer aspect.  my cousin said he'd explain it to me but i haven't been able to get a hold of him.  basically, what is the whole ranking system and perks and levels and stuff in the game all mean.  i have to wait about a week before i can play the game because my 360 is still at home.  if someone could kind of give me a breakdown of what it all means, that'd be great.