module unique_priority ();

byte a = 0;

// unique
always @ (*)
begin 
  unique if ((a==0) || (a==1)) begin
    $display("Unique if : 0 or 1"); 
  end else if (a == 2) begin
    $display("Unique if : 2"); 
  end else if (a == 4) begin
    $display("Unique if : 4"); 
  end
end
// priority
always @ (*)
begin
  priority if (a[2:1]==0) begin
    $display("Priority if : 0 or 1"); 
  end else if (a[2] == 0) begin
    $display("Priority if : 2 or 3"); 
  end else  begin
    $display("Priority if : 4 to 7"); 
  end
end
// unique case
always @ (*)
begin
  unique case(a) 
     0,1: $display("Unique Case 0 or 1");
     2  : $display("Unique Case 2");
     4  : $display("Unique Case 4");
  endcase
end
// priority case
always @ (*)
begin
  priority casez(a) 
    3'b00?: $display("Priority Casez 0 or 1");
    3'b0??: $display("Priority Casez 2 or 3");
  endcase
end
// unique case inside
always @ (*)
begin
  unique case(a) inside
     [0 : 3]: $display("Unique Case inside 0 to 3");
     2  : $display("Unique Case inside 2");
     4  : $display("Unique Case inside 4");
  endcase
end

initial begin
  repeat (7) begin
    #1 a ++;
  end
  #1 $finish;
end

endmodule