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This version of the decoder 4 bits to 7 segments is built with ROM, within which I wrote the codes 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79 and 0x71. This device shows all 16 hexadecimal symbols on the common-cathode LED display, corresponding to the 4 bit binary input.