Draw the following sequential circuit in the d-DcS simulator (click on the figure to open a trace of the network's schematic).

Once completed the schematic, using the timing simulation , verify the network behaviour. A suitable test sequence is available in the Timing Diagram window, starting from the !Reset activation. Compile a sequence table, as the following one, that will describe the numerical sequence generated on the outputs D, C, B and A:

Consider the resulting numerical sequence, assigning the weights 8,4,2,1 to the ouputs D, C, B, A. What is the function of the circuit?