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-%%%%%%%% PAGEREFERENCE MACROS
-% May 2nd, 1994
-% Peter Ungar, 914 723 7187, laxa@acfcluster.nyu.edu
-% 109 Lee Road, Scarsdale, N.Y. 10583-5229
-%
-\long\def\COMMENT#1!E{}
-%
-% MACROS BEGIN HERE
-\newwrite\inpr
-\message{Is this the second pass? (y or n)}
-\read16 to\answer
-\if n\answer\immediate\openout\inpr=\jobname.pgn%
-\def\wrx{\write\inpr}%
-\def\plbl*#1*{\wrx{\noexpand\let\csname prec#1\endcsname=\folio}}
-\def\pref*#1*{XX}
-\fi
-\if y\answer\closeout\inpr
-\input \jobname.pgn
-\def\plbl*#1*{}
-\def\pref*#1*{\csname prec#1\endcsname}
-\fi
-% MACROS END HERE
-
-\COMMENT
-
- We use the macros as follow. Suppose you want to refer to a page
-where you say something about Pythagoras. Put at the place to
-which you want to refer
-\plbl*pyth* Where you want to refer to this page, put
-\pref*pyth* Here, in the place of pyth, one may use any sequence
-of small and capital letters. Since the sequence will end up as
-part of a TEX control sequence, digits are unfortunately not
-allowed. (If that is very burdensome, we suggest encoding digits
-as capitals, A for 1 etc.) In the second pass, the macros insert
-a page number where there is a \pref.
-
- The macro \plbl (pagelabel), as defined when the answer to the
-question, Is this the second pass, was n, writes the page number
-into the file filename.pgn. To be precise, it creates a new
-control sequence, consisting of \prec followed by the letters
-identifying the label, which would result in \precpyth in the
-example we gave, and sets it equal to the page number. In the
-meanwhile, the \pref (page reference) macro is defined to print XX.
- For the second pass, we input the file of labels and the page
-numbers they signify which we wrote in the first pass. The
-pagenumber recording macro
-\plbl is redefined as vacuous, and the page reference macro \pref
-is set to insert the page number.
-
-!E
-
-
-This is a test of the page reference macro pair,
-$\backslash$plbl (pagelabel) and $\backslash$pref (pagereference)
-control sequences. There is a pagelabel command, with no effect on
-the tpyeset output, just before the period at the end of this
-sentence\plbl*aaa*.
-
-Reference to the page label on the next page: p.\pref*bb*;
-reference to the pgae label on this page: p.\pref*aaa*.
-\vfill
-\eject Here is a second pagelabel, just before the
-period\plbl*bb*. A reference to the first page label:
-p.\pref*aaa*, and a reference to the second page page label:
-p.\pref*bb*.
-
-\end