[options]
mode cover
depth 36

[engines]
smtbmc boolector

[script]
read -formal top.sv
prep -top top

[file top.sv]
module top(input clk);
    reg [33:0] bits = 0;
    reg [5:0] counter = 0;

    always @(posedge clk) begin
        counter <= counter + 1;
        bits[counter] <= 1;
        cover (&bits);
    end
endmodule