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From the population of teeth we pick up two teeth 1 and 2 FROM AN SPECIFIC RED CIRCLE and analyze how much these two teeth are alike each other.

Thereafter we pick up again two new teeth 3 and 4 again FROM ANOTHER SPECIFIC RED CIRCLE and analyze how much these two teeth are alike each other.

Since belonging to a arbitrarily defined red circle does not influences tooth health.

Certainly (1=2) and (3=4) not more (1=3) or (1=4) or (2=3) or (2=4)

Differences are only by random.