Instructions?

Per Wikipedia: A set consists of three cards which satisfy all of these conditions:

They all have the same number, or they have three different numbers.
They all have the same symbol, or they have three different symbols.
They all have the same border, or they have three different border.
They all have the same color, or they have three different colors.

The rules of Set are summarized by: If you can sort a group of three cards into "Two of ____ and one of _____," then it is not a set.

Valid set:

Valid set:

Invalid set:

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