It is {HEAD ~ an advantage} of {TAIL ~ the present invention} that the doorbell may be programmable to be answered by a neighbor or anyone else via the public switched telephone network to provide a heretofore unachieved ability to remotely answer a doorbell 
of
It is { HEAD ~ an advantage } of { TAIL ~ the present invention } that the doorbell may be programmable to be answered by a neighbor or anyone else via the public switched telephone network to provide a heretofore unachieved ability to remotely answer a doorbell
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH