Analyze the premise "All dogs are mammals."

This is a Venn Diagram describing dogs and mammals.

What do the four regions mean?

All dogs which are not mammals.

All dogs which are mammals.

All mammals which are not dogs.

Everthing that is not a dog or a mammal
is outside of both circles.

Since region 2 corresponds to the premise "All dogs are mammals,"
then region 1 should be shaded.

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