Let's complete the model. 3 stars should be added to show the value of the missing part. This shows that when the whole is 4 and one of the parts is 1, the other part must be 3.
Let's complete the model. 3 stars should be added to show the value of the missing part. This shows that when the whole is 4 and one of the parts is 1, the other part must be 3.
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