colouring riddle
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Consider a grid of size 4 by 4 (i.e. sixteen squares), where all squares should get a colour. The coloured grid should meet the following conditions:
4 squares should be coloured blue,
3 squares should be coloured red,
3 squares should be coloured white,
3 squares should be coloured green,
3 squares should be coloured yellow, and
no colour may appear more than once in any horizontal, vertical, or diagonal line.
How can the grid be coloured?
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