public class ExampleMod implements ModInitialzer {
    public static final VerticalSlabBlock POLISHED_ANDESITE_VERTICAL_SLAB = Registry.register(
        Registries.BLOCK,
        new Identifier("tutorial", "polished_andesite_vertical_slab"),
        new VerticalSlabBlock(FabricBlockSettings.copyOf(Blocks.POLISHED_ANDESITE)));
}