Display Built

How to build a 7 segment display?
I have a 7-segment display, (2) of 3×8 decoders and multiple forms of ET, NO, NO and portals. I have a function for each segment of the screen, but do not know how to connect the decoder output to the inputs of my office. The results of my functions are entries to display.
His "office" is what? It should look like a decoder with 10 inputs, one for each finger, and that the production of maps to show segments. You must pay for the two 3×8 decoders in a 4×10 decoder and connect the 10 entries for the son of his role "." make two decoders of 3×8 in a 4×10 decoder only the son of low order 3 bits in parallel the two decoders, and the most significant bit to the input validation of a decoder which allows the capture and bar in the other. The output is 0 seconds 7 and the first 8 to 15 ..
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