Effect of yeast, hops, aeration, etc. on OG reading?

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alpo

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Just curious, what kind of effect would the presence of:

A) a decent yeast starter (minus starter beer)
B) hop pellet fragments (assuming no hop bag)
C) vigorous manual aeration
D) oxygen injection
E) break material

...have on an OG reading?

I always measure OG before pitching and aeration, but I usually have hops in there.
 
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