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Zach, my point is it's the fact that it CAN differ that causes the difference (however slight it may be) between offspring to parent and sibling to sibling pairings.
It's like the difference between .00001 and 0. Sure, .00001 is pretty close to 0, and for most applications it doesn't matter which one you use, but if someone asks you what the difference between .0001 and 0 is, responding that "They're both the same." is wrong. And more importantly, it's not a useful answer.
-Kat
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