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+.\" This module is believed to contain source code proprietary to AT&T.
+.\" Use and redistribution is subject to the Berkeley Software License
+.\" Agreement and your Software Agreement with AT&T (Western Electric).
+.\"
+.\"	@(#)ttack	8.1 (Berkeley) 6/8/93
+.\" Copyright (C) Caldera International Inc. 2001-2002.  All rights reserved.
+.\" 
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions are
+.\" met:
+.\" 
+.\" Redistributions of source code and documentation must retain the above
+.\" copyright notice, this list of conditions and the following
+.\" disclaimer.
+.\" 
+.\" 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.
+.\" 
+.\" All advertising materials mentioning features or use of this software
+.\" must display the following acknowledgement:
+.\" 
+.\" This product includes software developed or owned by Caldera
+.\" International, Inc.  Neither the name of Caldera International, Inc.
+.\" nor the names of other contributors may be used to endorse or promote
+.\" products derived from this software without specific prior written
+.\" permission.
+.\" 
+.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
+.\" INTERNATIONAL, INC.  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 CALDERA INTERNATIONAL, INC. BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\" 
+.\" $FreeBSD$
+.\"
+.SH
+Acknowledgements
+.PP
+I am deeply indebted to J. F. Ossanna,
+the author of
+.UL troff ,
+for his repeated patient explanations
+of
+fine points,
+and for his continuing willingness to
+adapt
+.UL troff
+to make other uses easier.
+I am also grateful to Jim Blinn, Ted Dolotta,
+Doug McIlroy, Mike Lesk and Joel Sturman
+for helpful comments on this paper.
+.SH
+References
+.LP
+.IP [1]
+J. F. Ossanna,
+.ul
+.UC NROFF/TROFF
+User's Manual,
+Bell Laboratories
+Computing Science Technical Report 54, 1976.
+.IP [2]
+B. W. Kernighan,
+.ul
+A System for Typesetting Mathematics _ User's Guide
+.ul
+(Second Edition),
+Bell Laboratories
+Computing Science Technical Report 17, 1977.
+.IP [3]
+M. E. Lesk,
+.ul
+TBL _ A Program to Format Tables,
+Bell Laboratories
+Computing Science Technical Report 49, 1976.
+.IP [4]
+M. E. Lesk,
+.ul
+Typing Documents on UNIX,
+Bell Laboratories, 1978.
+.IP [5]
+J. R. Mashey and D. W. Smith,
+.ul
+PWB/MM _
+.ul
+Programmer's Workbench Memorandum Macros,
+Bell Laboratories internal memorandum.
+.IP [6]
+Eric P. Allman,
+.ul
+Writing Papers with NROFF using -me,
+University of California, Berkeley.