History:
1). Long long ago most houses were in holes of mountain;
2). Some houses were in holes of bigger trees;
3). Later some houses were made using wood;
4). Previous ground structures had {woods + stones + soil + ...+};How to taller?
5). Di Shang(gold) created {stone powder + glue + ...} put on ground until so far {solid + safity} ground structures. He helped many students{certifications + licenses};
6). After Di Shang(gold) built up 100 floors.
Fellowers {You can build up one floor + He can build up two floors + I can build up three floors + ... + Until 100 floors buildings builtup}.