dyaml/test/data/spec-02-28.structure

[
[(True, True), (True, True), (True, True)],
[(True, True), (True, True), (True, True)],
[(True, True), (True, True), (True, True),
(True, [
    [(True, True), (True, True), (True, True)],
    [(True, True), (True, True), (True, True)],
    ]),
]
]