.\" Copyright (c) 1986, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\"
.PS
circle diam .3i "\(ci"
circle diam .3i "\(ci" at 1st circle + (2i,0i)
circle diam .3i "\(bu" at 1st circle + (0.5i,-0.5i)
circle diam .3i "\(bu" at 2nd circle - (0.5i, 0.5i)
circle diam .3i "\(ci" at 1st circle - (0i,1i)
circle diam .3i "\(ci" at 5th circle + (1i,0i)
circle diam .3i "\(ci" at 2nd circle - (0i,1i)
circle diam .3i "\(ci" at 3rd circle - (0i,1i)
circle diam .3i "\(ci" at 4th circle - (0i,1i)
arrow from 1st circle to 3rd circle chop .15i chop .15i
arrow from 1st circle to 4th circle chop .15i chop .15i
arrow from 2nd circle to 4th circle chop .15i chop .15i
spline -> from 3rd circle right .5i up .075i then right .5i down .075i  chop .15i chop .15i
spline -> from 4th circle left .5i down .075i then left .5i up .075i chop .15i chop .15i
arrow from 3rd circle to 5th circle chop .15i chop .15i
arrow from 4th circle to 5th circle chop .15i chop .15i
arrow from 4th circle to 6th circle chop .15i chop .15i
arrow from 4th circle to 7th circle chop .15i chop .15i
arrow from 5th circle to 8th circle chop .15i chop .15i
arrow from 6th circle to 8th circle chop .15i chop .15i
arrow from 6th circle to 9th circle chop .15i chop .15i
.PE