Using the given, draw the waveforms for the following versions of a (each version is separate, i.e. not in the same run):

reg clk;

reg a;

always #10 clk = ~clk;

(1) always @(clk) a = #5 clk;

(2) always @(clk) a = #10 clk;

(3) always @(clk) a = #15 clk;

Now, change a to wire, and draw for:

(4) assign #5 a = clk;

(5) assign #10 a = clk;

(6) assign #15 a = clk;