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8 digit, four function calculator built from 4̶0̶0̶ 500 relays and q̶u̶i̶t̶e̶ ̶a̶ ̶l̶o̶t̶ ̶o̶f̶ ̶d̶i̶o̶d̶e̶s̶ hopefully no diodes
