<s>
Collective	B-Protocol
routing	I-Protocol
is	O
routing	B-Protocol
in	O
which	O
a	O
switching	O
center	O
automatically	O
delivers	O
messages	O
to	O
a	O
specified	O
list	O
of	O
destinations	O
.	O
</s>
<s>
Collective	B-Protocol
routing	I-Protocol
avoids	O
the	O
need	O
to	O
list	O
each	O
single	O
address	B-Protocol
in	O
the	O
message	O
heading	O
.	O
</s>
<s>
Major	O
relay	O
stations	O
usually	O
transmit	O
messages	O
bearing	O
collective-routing	O
indicators	O
to	O
tributary	O
,	O
minor	O
,	O
and	O
other	O
major	O
relay	O
stations	O
.	O
</s>
