module splice_demo(a, b, c, d, e, f, x, y); input [1:0] a, b, c, d, e, f; output [1:0] x = {a[0], a[1]}; output [11:0] y; assign {y[11:4], y[1:0], y[3:2]} = {a, b, -{c, d}, ~{e, f}}; endmodule