The object was to place the cubes in a line such that no face within any of the four rectangles so formed contained the same colour within that rectangle.
Then too, no colour was orthogonally adjacent to a face of the same colour in an adjoining rectangle.
Lastly the end faces of the composite prism were both different to each other and not repeated within the rectangular faces.
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The table above shows a set of cubic nets. Replace j, k, l & m with an appropriate label A, B, C or D to indicate the net used.
Additionally add just one digit to each cell in compliance with those nets so that each row along with the end values contains unique values.