A numerical sequence (e.g. 1,2,3,4,5 or 5,4,3,2,1 or in random order) is shown by
switching on the semaphore numbers one at a time. At the end of the sequence when
the semaphores show a green dot, we need to indicate the positions of the numbers in
an ascending sequence (therefore always 1,2,3,4,5). You can add a distraction element
(semaphore that illuminates red).
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