What is Rebecca Nurse’s explanation of the girls’ behavior? Why does she think they are acting this way?

Explanation:

Rebecca doesn't quite assume the girls' ailments are caused by sorcery. In reality, she just doesn't seem to suspect that perhaps the sisters are ill at all, rather than that they are engaging in other sort of "ridiculous" game, creating some juvenile trouble of their own.

in other words

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for one thing

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on the negative side

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what book are we talking about here