1$2          @=++++++++++=@
 2$2       =++++++++++++++++++=
 3$2     *++++++++++++++++++++++*
 4$2   =++++++++++++++++++++++++++=
 5$2  *++++++++$1-..........-$2++++++++*
 6$2 =++++++++$1..............$2++++++++=
 7$2@++++++++$1:.....$2:++$1:.....:$2++++++++@
 8$2=++++++++$1:.....$2++++$1.....:$2++++++++=
 9$2=++++++++$1:.....$2++++$1.....:$2++++++++=
10$2#++++++++$1:.....$2++++$1.....:$2++++++++#
11$2 +++++++++$1......$2--$1......$2+++++++++
12$2 @++++++++$1:............:$2++++++++@
13$2  @+++++++++++$1-....-$2+++++++++++@
14$2    *++++++++++$1::::$2++++++++++*
15$2      *++++++++++++++++++++*
16$2        @*++++++++++++++*@
17$2             @#====#@