You think that Google has an opinion on this matter??? You think Google is not indexing pages that contain "12:00am noon" for purposes of squewing results??? This may have something to do with your not understanding my analysis.
You say 12:00am and noon are contradictory. Yes. That's the point. You say 12:00pm and noon are mutually exclusive. You don't know what mutually exclusive means if you also think 12am and noon are contradictory. Elementary logic 101. Mutually exclusive means both can't be the case at the same time, like being pregnant and not being pregnant at the same time. This lack of logical ability and lack of grasping the meaning of commonly used phrases (mutually esclusive) could have something to do with your not understaing my analysis. (If you are going to come back and say you think 12:00am and 12:00pm are both contradictory to noon (it appears you may believe mutually exclusive means redundant, but I can't read your mind), then you need to look up contradictory. Just letting you know so you can do that in advance of replying.)
On a related note: "12:00pm" and "12:00 pm" match about 24,180,000 documents. "Mutually exclusive," which you used even though you don't know what it means, matches about 2,240,000 documents, far fewer. Do you see the point? You used something much less common than "12:00 pm" incorrectly.