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<p>I don’t see why it would be that confusing. In the Berkeley calculus book example, splitting it actually makes sense, because some students who take Math 1A and 1B do not continue on to Math 53, while some frosh do not need to take Math 1A or 1B and can start in Math 53. So those students would only need to buy one of the two volumes for $62.50 or $59.75 instead of both at $122.25 or the whole generic book at $194.15 to $219.96.</p>