minetest.register_alias("mapgen_air", "air")
minetest.register_alias("mapgen_stone", "air")
minetest.register_alias("mapgen_tree", "air")
minetest.register_alias("mapgen_leaves", "air")
minetest.register_alias("mapgen_apple", "air")
minetest.register_alias("mapgen_water_source", "air")
minetest.register_alias("mapgen_dirt", "air")
minetest.register_alias("mapgen_sand", "air")
minetest.register_alias("mapgen_gravel", "air")
minetest.register_alias("mapgen_clay", "air")
minetest.register_alias("mapgen_lava_source", "air")
minetest.register_alias("mapgen_cobble", "air")
minetest.register_alias("mapgen_mossycobble", "air")
minetest.register_alias("mapgen_dirt_with_grass", "air")
minetest.register_alias("mapgen_junglegrass", "air")
minetest.register_alias("mapgen_stone_with_coal", "air")
minetest.register_alias("mapgen_stone_with_iron", "air")
minetest.register_alias("mapgen_mese", "air")
minetest.register_alias("mapgen_desert_sand", "air")
minetest.register_alias("mapgen_desert_stone", "air")