Example with all variables modifiable

leadership_1:                 # A leadership
  - leader: value1            # A leader
    follower: example         # A follower
  - leader: value2            # A leader
    follower: example         # A follower
leadership_2:                 # A second leadership
  - leader:                   # A leader
    follower: val             # A follower
  - leader:                   # A leader
    follower: val             # A follower