How many shapes does the math problem in the first grade of primary school have? List several different formulas.

* * * There are four kinds of figures: hollow circle, solid circle, hollow square, solid square ***4+2=6 (hollow circle+solid circle = total circle) 4+2=6 (hollow square+solid square = total square) 2+2=4 (hollow square+hollow circle = total hollow figure) 2+

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