parent:
  a: |
    multiline literal
    line 2
  b: >
    multiline folded
    line 2
  c: |-
    multiline literal strip
    line 2
  d: >-
    multiline folded strip
    line 2
  e: |+
    multiline literal keep
    line 2
  f: >+
    multiline folded keep
    line 2