040000 tree bb0d9c3f133fc5f64d229aa8c535a8bdab367efd	Data-Structures
040000 tree c1a09446a80e9e057fd985509f8271e983c25f62	Expedited-Grace-Periods
040000 tree ecf31af66847f36864dc99709dc9effd7037ccbe	Memory-Ordering
040000 tree ddbed18d954189175ce2e0e4888957b8aa4f437c	Requirements