$protocols		-	(ip|tcp|udp) (1 word)
					object-group <protocol object-group name> (2 word)

$source_network	-	host <host name> (2 words)
					<ip address> <wildcard mask> (2 words)
					object-group <network object-group name> (2 words)
					any (1 word)

$dest_network	-	host <host name> (2 words)
					<ip address> <wildcard mask> (2 words)
					object-group <network object-group name> (2 words)
					any (1 word)

$port			-	eq <port_no> (2 words)
				-	range <low_port> <high_port> (3 words)
				-	<blank> (0 word)