Description is in the title.
One more thing to add here. There is a bug in the B/C DEC lab for this round 3. (http://www.eternagame.org/game/puzzle/7254812/) The puzzle asks for a barcode hairpin - which is something that was only relevant for our past static cloud labs. This puzzle ask for the barcode hairpin to be unique and it is tied to the C input - which we for good reasons can't change. In practice this means it not possible to post solutions to this lab.