believe that each assertion they have made is true.

(2) However, they know, having learned from experience, that, despite their best efforts, there are very likely undetected errors in their book. So they also have good reason to believe that there is at least one assertion in their book that is not true.

Thus, they have good reason, from (1), to rationally believe that each statement in their book is true, while at the same time they have good reason, from (2), to rationally believe that the book contains at least one error.

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