# refer from the 7th edition

386	- sys sys
	bin	- sys sys
		refer	- sys sys
			+	- sys sys
sys	- sys sys
	man	- sys sys
		1	- sys sys
			refer	- sys sys
			bib2ref	- sys sys
sys	- sys sys
	src	- sys sys
		cmd	- sys sys
			refer	- sys sys
				+	- sys sys
lib	- sys sys
	refer	- sys sys
		+	- sys sys
	eign	- sys sys