It is not, actually, one of the advantages that plan proponents have pointed out. The author mentions it this one time, and the author is not a proponent. Furthermore, the word "primary" would disqualify the choice even if the above were true. Watch out for that word -- the LSAT uses it and misuses it all the time...
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Every once in awhile I host a
free online workshop/question&answer session. called
Zen and the Art of LSAT You can check out a few recordings from past sessions here:
http://www.manhattanlsat.com/zen-and-the-art.cfm