There must be three and only three terms

The middle term must not occur in the conclusion

If a term is distributed in the conclusion, then it must be distributed in the premises

The middle term must be distributed at least once

No conclusion can follow from two negative premises

If the two premises are affirmative, the conclusion must also be affirmative

If either premise is negative, the conclusion must be negative

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Logic 7 rules

Term	Definition
Rule 1	There must be three and only three terms
Rule 2	The middle term must not occur in the conclusion
Rule 3	If a term is distributed in the conclusion, then it must be distributed in the premises
Rule 4	The middle term must be distributed at least once
Rule 5	No conclusion can follow from two negative premises
Rule 6	If the two premises are affirmative, the conclusion must also be affirmative
Rule 7	If either premise is negative, the conclusion must be negative