Norm, he said the failure rate decreases, making the levels go up faster. Well then I recommend testing with two pets and uptiered to compare if Pale’s hypothesis worked (HIGHLY DOUBT)

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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z) Probability

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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z) Probability