Opposite faces of this cube have the same colour: top and bottom red, front and back blue, the two sides green. After cutting along the lines, how many small cubes show exactly two different colours?

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36. Two different colours appear only where two faces meet, on an edge, and every edge joins two differently coloured faces. Each edge has 5-2=3 cubes that are not corners, and 12×3=36. Corner cubes show all three colours.

Opposite faces of this cube have the same colour: top and bottom red, front and back blue, the two sides green. After cutting along the lines, how many small cubes show exactly two different colours?

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