040000 tree bc3a66f6125079eb543273dd7b7b3fd26da42151	Data-Structures
040000 tree 5e9a99147624251ebea7064c9f18e1fa668c1db7	Expedited-Grace-Periods
040000 tree 4db6af18d28289ce16c1fdc915c3d85522932fe4	Memory-Ordering
040000 tree a4c7b368b6d635f59103c833086eba45cc661d01	Requirements