ADVICE, SHOULD, SHOULDN'T, OBLIGATION, MUST, HAVE TO / HAS TO, NECESSITY, NEED TO, DON'T NEED TO, DOESN'T NEED TO, PROHIBITION, MUSTN'T, DON'T HAVE TO, DOESN'T HAVE TO, ABILITIES / PERMISSION, CAN, CAN'T, COULD, POSSIBILITY, MAY, MIGHT

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