recipes.remove(<minecraft:concrete_powder:8>);
recipes.remove(<minecraft:furnace>);

recipes.addShaped(<minecraft:furnace>, [[<ore:concrete>, <ore:concrete>, <ore:concrete>], [<ore:concrete>, <immcraft:furnace>, <ore:concrete>], [<minecraft:concrete:8>, <ore:concrete>, <minecraft:concrete:8>]]);

recipes.addShaped(<minecraft:concrete_powder:8>, [[<ore:dustCoal>, <ore:dyeLightGray>, <ore:dustCoal>], [<minecraft:sand>, <ore:sand>, <ore:sand>], [<minecraft:gravel>, <minecraft:gravel>, <ore:railBed>]]);
