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None. They are synonyms, although they also have separate different meanings. 稍等 = 稍候 = wait a minute. 等候 = 等 = 候, although 候 is rarely used as a single character with this meaning.
There is no differences between 等 and 候. Both means "to wait". You can also put them together as a word 等候, with the same meaning - to wait. However, 候 sounds like the usage in classical Chinese (archaic Chinese), and therefore rarely use as only one single character in modern Chinese.
The summary of 来's usage, as a complement to user3306356's answer. You can use 来 as a concrete verb, as in 奥巴马来北京见维尼熊, which you already know. Less concrete it is when 来 is used in some verb serializations, as in 过来, 上来, the main verb is 过 or 上, 来 only functions as an indication of "towards me". Sometimes 来 is used metaphorically, as in 我醒来了. Even less ...
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