time_units: generations
defaults:
  deme:
    ancestors: [a, b, c]
    proportions: [0.1, 0.7, 0.2]
demes:
- name: a
  ancestors: []
  proportions: []
  epochs:
  - {start_size: 1}
- name: b
  ancestors: []
  proportions: []
  epochs:
  - {start_size: 1}
- name: c
  ancestors: []
  proportions: []
  epochs:
  - {start_size: 1}
- name: x
  start_time: 100
  epochs:
  - {start_size: 1}
- name: "y"
  start_time: 100
  epochs:
  - {start_size: 1}
- name: z
  start_time: 100
  epochs:
  - {start_size: 1}