Disco Floor Every Other Column Flash

rednet.open("bottom")

instructions = {}
instructions[1] = "on"

local speed = 0.001

while true do
 for i=1,15 do
  for j=1,15 do
   if j%2 ~= 0 then
     instructions[2] = tostring(j)
     rednet.broadcast(instructions,tostring(i))
     sleep(speed/10)
    end
  end
 end

 shell.run("reset")
 sleep(speed)

 for i=1,15 do
  for j=1,15 do
   if j%2 == 0 then
     instructions[2] = tostring(j)
     rednet.broadcast(instructions,tostring(i))
     sleep(speed/10)
    end
  end
 end

 shell.run("reset")
 sleep(speed)

end