Changes by Gunnar Ritter, Freiburg i. Br., Germany, September 2005.

Derived from Plan 9 v4 /sys/lib/tmac/tmac.ptx

Copyright (C) 2003, Lucent Technologies Inc. and others.
All Rights Reserved.

Distributed under the terms of the Lucent Public License Version 1.02.

Sccsid @(#)ptx 1.2 (gritter) 11/6/05
'''\" from ptx.src (ptx.src 1.1) - format permuted index macro .tr ~ .nr )y \n(.lu-.65i .nr )x \n()yu/2u \h\\n()xu-\w\\$1\\*(s1\\$2\\*(s2u\\$1\\*(s1\\$2\\*(s2\\$3\\*(s3\\$4\\*y\\$5 ..