multiplication table

integer i
integer x
integer y
integer z
integer a

for i = 4; i <= 16; i = i + 4
   for x = 3; i <= 12; x = x + 3
      for y = 2; y <= 8; y = y + 2
         for z = 1; z <= 4; z = z + 1
            Put z to output
            Put " " to output
            
      Put y to output
      Put " " to output
      Put x to output
      Put " " to output

   Put i to output
   Put " " to output