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If A, then B.
A.
So B.
alternate ways of saying the same thing
If A, then B.
Not B.
So, Not A
the denial of a statement
If A, then B.
If B, then C.
So, If A, then C
statements of the form "Either A or B"
EIther A or B
Not A
So, B
(A and B can be interchanged in the second and third premise, as long as it remains constant)
Either A or B.
If A, then C.
If B, then D.
So, either C or D.
checking to see whether the argument made is a form on the famous list; if it is, it is valid
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