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module test(input clk, input [3:0] bar, output [3:0] foo);
reg [3:0] foo = 0;
reg [3:0] last_bar = 0;
always @*
foo[1:0] <= bar[1:0];
always @(posedge clk)
foo[3:2] <= bar[3:2];
always @(posedge clk)
last_bar <= bar;
assert property (foo == {last_bar[3:2], bar[1:0]});
endmodule
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