print SIZE_1 / 2 pairs of checker rows


for (int i = 1; i <= SIZE_1 / 2; i++)
   print a pair of checker rows


for (int i = 1; i <= SIZE_1 / 2; i++)
   print a checker row of type @
   print a checker row of type *


for (int i = 1; i <= SIZE_1 / 2; i++)
   print SIZE_2 @-rows
   print SIZE_2 *-rows


for (int i = 1; i <= SIZE_1 / 2; i++)
   for (int j = 1; j <= SIZE_2; j++)
      print @-row
   for (int j = 1; j <= SIZE_2; j++)
      print *-row


for (int i = 1; i <= SIZE_1 / 2; i++)
   for (int j = 1; j <= SIZE_2; j++)
      print SIZE_1 /2 @*-pairs
   for (int j = 1; j <= SIZE_2; j++)
      print SIZE_1 /2 *@-pairs


for (int i = 1; i <= SIZE_1 / 2; i++)
   for (int j = 1; j <= SIZE_2; j++)
      for (int k = 1; k <= SIZE_1 /2; k++)
         print @*-pair
   for (int j = 1; j <= SIZE_2; j++)
      for (int k = 1; k <= SIZE_1 /2; k++)
         print *@-pair


for (int i = 1; i <= SIZE_1 / 2; i++)
   for (int j = 1; j <= SIZE_2; j++)
      for (int k = 1; k <= SIZE_1 /2; k++)
         print SIZE_2 @s
         print SIZE_2 *s
   for (int j = 1; j <= SIZE_2; j++)
      for (int k = 1; k <= SIZE_1 /2; k++)
         print SIZE_2 *s
         print SIZE_2 @s


for (int i = 1; i <= SIZE_1 / 2; i++)
   for (int j = 1; j <= SIZE_2; j++)
      for (int k = 1; k <= SIZE_1 /2; k++)
         for (int n = 1; n <= SIZE_2; n++)
            print("@")
         for (int n = 1; n <= SIZE_2; n++)
            print("*")
   for (int j = 1; j <= SIZE_2; j++)
      for (int k = 1; k <= SIZE_1 /2; k++)
         for (int n = 1; n <= SIZE_2; n++)
            print("*")
         for (int n = 1; n <= SIZE_2; n++)
            print("@")