the digets are 1,2,3,4 and 5.
the 1st diget +the 2nd diget=the 3rd diget.
2nd diget is 2x the 3rd diget.
2nd diget is half of the 4th diget.
2nd diget is half of the 4th diget.
5th diget is the sum of the 1st and 4th digets.
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