040000 tree bd3ac2c697ac6bb8ff2b3659fbfbd4ea4ce09987	Data-Structures
040000 tree 6ea591b5cfcdb09b0776793990d1c1e445b925c9	Expedited-Grace-Periods
040000 tree de03ed07caf7e747470e8c8b2cb6057d341c3bee	Memory-Ordering
040000 tree 9aee44d7c030e3084597ae4d07728a25330eb95d	Requirements