Deduction
Must, can be used for deduction.
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I have had no sleep for two hours.
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You must be exhausted.
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The police are stopping all cars.
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They must be looking for the escaped prisoner.
Imagine that we have 3 keys and one of these keys opens the door. We pick the first key and say “this might be the
key” but after trying the first key unsuccessfully we will pick the second key and say “this may be the key” but after
trying two keys unsuccessfully we’ll pick the third key and say “this must be the key”.
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