Newbie Odds Question

[Scorpius]

I want to thank all of you for your previous responses. I am a fairly new player to omaha/8 and your input is really helping me. I have another question, this time about outs. Can someone explain how a draw to two pair is 4 outs? A chart from Krieger's article at cardplayer.com says 4 outs, but if you need one card to make two pair, isn't that 3 outs (you've already got one pair and one card of the other pair...doesn't that leave just 3 of the second pair available to draw)? Also, can someone explain the outs for a full house? The outs seem to be different depending on whether you have the pair in your hand or on the board. Is this right? Thanks.