put 5 pixels of the things you want and then type !set x all 300 anymore than 5 will make bhol
It's a useful trick sometimes. If you like making alloys/composites or explosives, it can very vrey useful.
Make a horizontal line of pixels. Then use property tool, set to X:120, or whatever number. Use this tool on the line, and the resulting 1 pixel at X:120 or whatever will be layered.