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Ex is short for example (as is e.g.).
It would be difficult to provide an accounting of all the relevant abbrevations, but outside of the Reading Comprehension guide, it's more important that you use abbreviations that are useful to you. They don't have to make sense to anyone else. If you would like a list of standard English abbreviations, you should be able to find one in a dictionary.
As for the specific abbreviations used in the guide, most of them are simply shortened versions of text from the relevant passages. I noticed that the abbreviation "w/o" is frequently used for "without," and we sometimes use mathematical symbols such as > and = to indicate relationships.
I hope this helps. If there are additional abbrevations used in our book that you have trouble deciphering, definitely let us know.
_________________ Dmitry Farber Manhattan GMAT Instructor
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