Placing a Redstone Repeater or Redstone Comparator vertically doesn't use up the block, so you can very easily dupe them.
[m←[1;31m[17:47:25] [main/FATAL] [minecraft/Main]: Failed to start the minecraft server net.minecraftforge.fml.LoadingFailedException: Loading errors encountered ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results