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040000 tree d5365f993b2bbd8891e91af0f98346dc46275301	hal
040000 tree 8157ca2c2ee110581bd49b68a31b922901f4ef34	log
040000 tree 38fac9fe9e0889e0fcca06cef5d607d60efe1b3c	math
040000 tree 3d80b570cb68ac2fe47516d3e283ecac344be00f	profiler
040000 tree 3d6d9ef88267b48d673f6c4971e1cbfd431b33aa	use_case