a1: name: a1 sort_order: 1 b1: name: b1 parent: a1 sort_order: 1 b2: name: b2 parent: a1 sort_order: 2 # Note that the names are not alphabetically ordered: c16: name: c1-six parent: b1 sort_order: 6 c17: name: c1-seven parent: b1 sort_order: 7 c18: name: c1-eight parent: b1 sort_order: 8 c19: name: c1-nine parent: b1 sort_order: 9 c2: name: c2 parent: b2 sort_order: 1 d2: name: d2 parent: c2 sort_order: 1 e2: name: e2 parent: d2 sort_order: 1 f3: name: f3 f4: name: f4