Simpler 9fs sources.
 [rsc] --rwxrwxr-x M 1372441 glenda sys 986 Jan 27 13:09 rc/bin/9fs
	/n/sourcesdump/2006/0127/plan9/rc/bin/9fs:21,28 - 
	/n/sourcesdump/2006/0128/plan9/rc/bin/9fs:21,27
	  	srv -q il!jukefs && mount /srv/il!jukefs /n/njuke && bind -c /n/njuke/juke /n/juke
	  case sources
	  	srv -q tcp!sources.cs.bell-labs.com sources /n/sources &&
	- 		{ mount /srv/sources /n/sources ||
	- 		  mount -n /srv/sources /n/sources }
	+ 		mount -n /srv/sources /n/sources
	  case sourcesdump
	  	9fs sources
	  	mount /srv/sources /n/sourcesdump main/archive