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From the
population of teeth we pick up two teeth �1� and �2� by random and analyze how
much these two teeth are alike each other in relation their health status. Thereafter we pick up again two new teeth �3� � and �4� � again by random and analyze how much these two teeth are alike each other in relation their health status. Certainly (1=2) and (3=4) not more (1=3) or (1=4) or (2=3) or (2=4) Differences / similarities in health status are only by random. |