25. In the figure shown below, colour each of the equilateral triangles with any one
of 4 colours: blue, yellow, green or red so that no two triangles will have the
same colour. How many different possible ways of colouring the figure are
there? (Two ways of colouring the figure are considered the same if we can
obtain one colouring from another by rotating the entire figure, reflecting the
figure however counts as a different colouring.)
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