| Base and line maintenance: | ●●●●●●●●●● |
| Base and line maintenance: | ●●●●●●●●●● |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● |
| Line maintenance: | ●●●●●●●●●● |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● | |
| ●●●●●●●●●● |
●●●●●●●●●●
| ●●●●●●●●●● |
| ●●●●●●●●●● |
| ●●●●●●●●●● | ●●●●●●●●●● |
| ●●●●●●●●●● | ●●●●●●● | ●●●●●●●●●● |
| ●●●●●●●●●● | ●●●●● | ●●●●●●●●●● |
| ●●●●●●●●●● | ●●●●● | ●●●●●●●●●● |
| ●●●●●●●●●● | ●●●●●●●● | ●●●●●●●●●● |
| ●●●●●●●●●● | ●●●●●●●●●● | ●●●●●●●●●● |
| ●●●●●●●●●● | ●●●●●●●●●● | ●●●●●●●●●● |