Chapter 3 Graph Modification

3.3 Get Vertices

## + 5/5 vertices, from ded6328:
## [1] 1 2 3 4 5

3.3.1 Add vertices attribute

## $rooms
## [1] "LR"     "FR"     "BR"     "DR"     "Garage"
## 
## $label
## [1] "a" "b" "c" "d" "e"