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module top;
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integer result;
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initial begin
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result = $countbits(top);
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result = $countbits("a string");
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result = $countbits(1'bx);
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result = $countbits("a string", 1'bx);
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result = $countbits(1'bx, "a string");
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result = $countbits(1'bx, 1'bx, "a string");
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end
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endmodule
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