digraph G {
	net [label="gsm_network"]
	subconns [label="subscr_conns"]
	sub [label="gsm_subscriber"]
	subcon [label="gsm_subscriber_conn"]
	subgrp [label="gsm_subscriber_group"]

	net -> subconns
	subconns -> subcon [label="llist"]
	subcon -> sub
	subcon -> net

	sub -> subgrp
	subgrp -> net
}