040000 tree 40260110841e4d54ef6a2421edb77a5f7cf6531b	Data-Structures
040000 tree 7d2cbe70c8462afb3b0882e7bc0b14042f403d44	Expedited-Grace-Periods
040000 tree 681a612a22cfb89eba0f085b190c1435bc3e1b1d	Memory-Ordering
040000 tree 050ec4fb5017a34228dc18cca15abcbda708a3e2	Requirements