There already is a 1.5 second grace period between the time a gem is replaced in your draw slot by the new gem and the time you can place the gem that was previously there into play, like if you had it still on your cursor. It's not enough to compensate for someone getting a significant lag spike, but it helps with slower connections and reaction time issues.
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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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