val structure = StructureBuilder.start().
                  layer("lll", "l l", "lll").
                    where('l').is((Blocks.log, 0, null), (Blocks.log, 1, null), (Blocks.log, 2, null), (Blocks.log, 3, null)).
                  layer("s s", "   ", "s s").
                    where('s').is((Blocks.stone, 0, null), (Blocks.cobblestone, 0, null)).
                  layer("lll", "l l", "lll").
                    where('l').is((Blocks.log, 0, null), (Blocks.log, 1, null), (Blocks.log, 2, null), (Blocks.log, 3, null)).
                  build()