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module test1(a, b, x, y);
input [7:0] a, b;
output [7:0] x, y;
inc #(.step(3)) inc_a (.in(a), .out(x));
inc #(.width(4), .step(7)) inc_b (b, y);
endmodule
// -----------------------------------
module test2(a, b, x, y);
input [7:0] a, b;
output [7:0] x, y;
inc #(5) inc_a (.in(a), .out(x));
inc #(4, 7) inc_b (b, y);
endmodule
// -----------------------------------
module inc(in, out);
parameter width = 8;
parameter step = 1;
input [width-1:0] in;
output [width-1:0] out;
assign out = in + step;
endmodule
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