tellraw @a[tag=dev] ["",{"text":"DO ","color":"yellow"},{"text":"NOT","bold":true,"color":"dark_red"},{"text":" USE ","color":"yellow"},{"text":"BLUE WOOL/WARPED PLANKS","color":"blue"},{"text":" OR ","color":"yellow"},{"text":"RED WOOL/CRIMSON PLANKS","color":"red"},{"text":" IN YOUR MAP! (You can use double slabs to avoid removal) ","color":"yellow"},{"text":"IT WILL BE DELETED!","bold":true,"color":"dark_red"}]