| ⇢ | A | Version20191226053339 added | |
| A | ↛ | Version20191222053729 removed |
| ⇢ | B | Version20191226053339::up() added | |
| ⇢ | B | Version20191226053339::down() added | |
| ⇢ | A | Version20191226053339::getDescription() added | |
| B | ↛ | Version20191222053729::up() removed | |
| B | ↛ | Version20191222053729::down() removed | |
| A | ↛ | Version20191222053729::getDescription() removed |