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In this circuit you push any button 1 through 4, and you get 4 lights outputting the same information 4 buttons has, only changed putting a "hex" on coupling further to 8-bits. There are as many inputs as outputs. Hex is a numerical form of counting, however not uses the same ten digits, it is similar to a key legend on a map, "this" equals "that," hex goes from 0 to F having 16 logical single character digits, while decimal is 0 to 9 having “a just” 10. In binary however there is not a difference unless viewed, "this equals that" changes the higher you count seemingly in a challenge scramble that is cryptic by crimp legend. It's not entirely useful least communications because it's just extra work for not much a reason one circuit to do so unless interfacing to another, hence communications, major uses are encrypting secret messages and games. The juncture of more then one light for any one switch thrown is great for many things happening like in games. - nforystek
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