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In the design module, use ANSI-style port declarations to reduce redundant port lists (refer to IEEE-Std 1800-2017, section 23.2.1 Module header definition): module ADDER ( input a, input b, input c_in, output sum, output c_out ); In the testbench, use connections-by-name instead of connections-by-order: ADDER adder ( .a (...

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