19. Each of ten points in the figure is marked with either 0 or 1 or 2. It is known that
the sum of numbers in the vertices of any white triangle is divisible by 3, while the
sum of numbers in the vertices of any black triangle is not divisible by 3. Three of
the points are marked as shown in the figure. What numbers can be used to mark
the central point?
(A) Only 0. (B) Only 1. (C) Only 2. (D) Only 0 and 1. (E) Either 0 or 1 or 2.
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