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Given     A  B
          X C  D
the value of D  could be anything from 1 to 9
if D=1 DDD=111
D=2 DDD=222 and so on. 
if we would take A=3, B=7, C=1, D=5
then DDD=555
so A+B+C+D= 3+7+1+5=16
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