PT66.S3.G1 - a chemistry class has 6 lab sessions

mrueda08

http://7sage.com/lsat_explanations/lsat-66-section-3-game-1/
For this game, the instructor said "J" and "O" can't be stacked together because the rule is: "J" comes earlier than "O." If "J" is stacked with "O," with "J" in the a.m. and "O" in the p.m., isn't that still J - O?

emli1000

According to rule #4 J must MEET ON AN EARLIER DAY then O. Therefore you cannot place O on the PM slot because J & O cannot not be on the same day since J is a DAY before. For example if you place J on Wed AM and O on Wed PM then that is on the same day, and J is a day earlier. Make sure you do not contradict rule #4 (J-O).