CG4: fix

cgroup4.sv

@@ -8,7 +8,7 @@ int A, B;
 
 covergroup cg @(posedge clk);
   pb1: coverpoint A {
-    bins bb[] = {0:3};
+    bins bb[] = {0,1,2,3};
     };
   pb2: coverpoint B;
   pb1x2: cross A,B;