I was just looking at the explanations for some of the logic games from preptests in the mid 60s and saw how there's been a trend in the last few years of emphasizing the use of xor/exclusive or/negated biconditional in logic games (a is before b or before c but not before both). Since I don't have access to the very most recent preptests (2012-2014), I was wondering if there have been any other such changes to question patterns or emphasis on the LSAT, particularly in LG. Anyone have any thoughts?