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module tst(di,do);
input [15:0] di;
output [3:0] do;
integer aa,bb;
always @(di)
begin
bb<=0;
for (aa=0; aa<16; aa=aa+1)
if (di[aa])
bb<=bb+1;
// bb = bb + di[aa];
end
assign do = bb;
endmodule
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