# sequencer protocols for Laser eye surgery
---
- step:  &id001                  # defines anchor label &id001
    instrument:      Lasik 2000
    pulseEnergy:     5.4
    spotSize:        1mm

- step: *id001                   # refers to the first step (with anchor &id001)
- step: *id001
    spotSize: 2mm 
- step: *id002
- {name: John Smith, age: 33}
- name: Mary Smith
  age: 27
 men: [John Smith, Bill Jones]
women:
  - Mary Smith
  - Susan Williams