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% LETTER PSIZZL - letter macros
%
% I am indebted to Louise Addis, SLAC, for help in designing the
% style of the letter.
%
% The letter will print with your institution's letterhead.
% You then take the letter and copy it on bond.
% The original hardcopy becomes your file copy.
%
% \letterto{Name}{address}   Name will appear in the salutation.
%                            note the comma or colon here.
% e.g.,                      address will be the full address.
% \letterto{John,}%          use \cr to separate lines.
%    {Mr.@John Doe\cr%
%     Physics Department\cr%
%     University of California, Berkeley\cr%
%     Berkeley, CA 94720\cr}%
%
% \letterfrom{signature}{mail stop}{initials}
%                            initials will possibly appear at the foot of
% e.g.,                      the letter
% \letterfrom%               signature will appear in the close
%    {Jane Doe\cr            address is incorporated in the letterhead
%     Chief Honcho\cr}%
%    {Bin 2}{JD}%
%
% \letterdate{date}          you may optionally specify the date of the
%                            letter. The default date however, is today.
% e.g., \letterdate{7 July 1983}%
%
% \salutation{Ave}%          here's how to modify the standard salutation
%                            (default is Dear)
%
% \MyRef{text}%              specifies the writer's reference number for
%                            this letter. Default is none.
%                            If you use this you get Ref: <text> near
%                            the top of the letter.
%
% \YourRef{text}%            similar to \MyRef. Specifies the reference
%                            number of the addressee's letter to which
%                            you're responding. Default is none.
%
% \copiesto{name\cr name\cr ...name\cr}%
%                            specifies who gets copies of the letter
%                            aside from the addressee. A list of names
%                            will appear at the end of the letter.
%                            Default is none
%
% \closing{Yours truly,}%    and how to modify the standard close
%                            (default is Sincerely,)
%
% \everyletter{text}%        text to be inserted
%                            at the end of every letter.
%                            May be an entire letter body.
%
% \beginletter               the letter now begins on a new page
%                            with date, address, salutation
%
% text                       now comes the text of the letter
%
% \endletter                 this puts out the closing
%
\newif\ifletter
\newskip\lettertopskip\lettertopskip\z@ plus\z@ minus\z@
\def\letterdate#1{%
   \def\l@tterdate{#1}%
   }\letterdate\d@te
\def\salutation#1{%
   \def\s@lutation{#1}%
   }\salutation{Dear}%
\def\closing#1{%
   \def\cl@sing{#1}%
   }\closing{Sincerely,}%
\def\typist#1{%
   \def\t@pist{:\lowercase{#1}}%
   }\def\t@pist{}%
\def\copiesto#1{%
   \def\c@pies{%
      \hbox{%
         \vtop{\hbox{cc: }\vfil}%
         \vtop{\singlespace
            \halign{\vbox{\parindent\z@\hsize.8\hsize####}\hfil\cr
               #1\crcr}%
            }%
         }%
      \vskip\baselineskip
      }%
   }\def\c@pies{}%
\def\postscript#1{%
   \def\p@st{#1}%
   }\def\p@st{}%
\def\enclosure#1#2{%
   \def\@ncl{%
      {\par\parindent\z@#1\par\singlespace
         \halign{%
            \quad\vbox{\parindent\z@\hsize.8\hsize####}\hfil\cr
            #2\crcr}\par
         }%
      }%
   }\def\@ncl{}%
\def\prescript#1{%
   \def\pr@{#1}%
   }\def\pr@{}%
%
\def\MyRef#1{%
   \def\M@Ref{Ref: #1\cr}%
   }\def\M@Ref{}%
\def\YourRef#1{%
   \def\Y@urRef{Your Ref: #1\cr}%
   }\def\Y@urRef{}%
%
\def\breakletter{%
   \par\vfil\eject
   }% break the title page of a letter
\def\letterto#1#2{%
   \def\@ddressee{#1}\gdef\@ddress{#2}%
   }\letterto{}{}%
\def\letterfrom#1#2#3{%
   \def\s@ndername{#1}\gdef\s@nderbin{#2}\gdef\s@nderinitials{#3}%
   }\letterfrom{}{}{}%
\def\letterstyle#1{%
   \adddef\stylel@t{#1}%
   }%
\def\stylel@t{%
   \let\bodynumbers=\topcentered
   \vsize 8.3in
   \raggedright
   \p@geclear% set page number
   \largetype\singlespace
   \parindent 0em
   \baselineskip 2.7ex
   \parskip\medskipamount
   }%
\long\def\everyletter#1{\def\l@tterbody{#1}}\everyletter{}%
\def\letter{%
   \let\resd@c\resl@t
   \let\pred@c\prel@t\let\styled@c\stylel@t\let\titd@c\titl@t
   \let\frontd@c\frontl@t\let\endd@c\endl@t\lettertrue
   }%
\def\beginletter{\letter\begindocument}%
\def\endletter{\enddocument}%
\def\frontl@t{}%
\def\resl@t{\endpage}%
\def\prel@t{\beginbody}%
\def\titl@t{%
   \topinsert
      \ifwindowenvelope
         \translate{-.0in}{-1.5in}{%
            \ifx\@ddress\empty\else
               \vbox to 1.in{%
                  \singlespace\baselineskip 2.7ex\vss
                  \halign to 4.35in{\tabskip\z@
                     ##\hss\tabskip\z@ plus 1fil\cr\@ddress\crcr
                     }\vss
                  }%
               \fi
            }%
         \nointerlineskip
         \fi
      \l@tterhead
      \endinsert
   \fr@nttrue
   \rightline{\l@tterdate}\vskip\the\baselineskip
   \tempfalse
   \ifx\M@Ref\empty\else\temptrue\fi\ifx\Y@urRef\empty\else\temptrue\fi
   \iftemp
      \rightline{%
         \vbox{%
            \singlespace\halign{##\hfil\cr\M@Ref\Y@urRef}%
            }%
         }%
      \par
      \fi
   \vfil
   \vskip\lettertopskip
   \ifwindowenvelope\vskip1.20in\else
      \ifx\@ddress\empty\else
         {%\singlespace\indent
            \hbox{\vbox{\halign{##\hfil\cr\@ddress\crcr}}}%
            }%
         \par
         \vskip2\parskip
         \fi
      \fi
   \par\pr@\par
   \ifx\@ddressee\empty\else
      \medskip\s@lutation\ \@ddressee\par\medskip
      \fi
   }%
\def\endl@t{%
   \l@tterbody
   \par
   \ifx\s@ndername\empty\else
      \nobreak\vskip 4.5ex%
      \line{%
         \hbox to .51\hsize{\hfil}\hskip\z@ minus 1fil
         \vbox{\singlespace\baselineskip 2.7ex%
            \halign{##\hfil\cr\cl@sing\cr\noalign{\nobreak\vskip.4in}%
               \s@ndername \crcr
               }%
            }%
         \hskip\z@ plus 1fill
         }%
      \fi
   {\normalbaselines
      \ifx\s@nderinitials\empty\else
         \par\s@nderinitials\t@pist\par
         \fi
      \@ncl
      \c@pies
      {\singlespace\p@st\par}%
      }%
   \vfil\eject
   \gdef\t@pist{}\gdef\c@pies{}\gdef\M@Ref{}\gdef\Y@urRef{}%
   \gdef\pr@{}\gdef\p@st{}%
   \letterfalse
   }%
\newdimen\h@ght\h@ght=1in
\newdimen\l@tterheadsize\l@tterheadsize\hsize
\def\letterhead#1#2#3#4{%
   \def\l@tterhead{%
      \ifletterhead
         \l@tterheadsize\hsize\advance\l@tterheadsize0in
         \centerline{%
            \vbox{\hsize\l@tterheadsize
               \centerline{\vbox{\halign{####\hfil\cr#1\crcr}}}%
               \line{%
                  \singlespace\baselineskip 2.7ex%
                  \vbox to \h@ght{\vss\halign{####\hfil\cr#2\crcr}\vss}%
                  \hss
                  \vbox to \h@ght{\vss\halign{####\hfil\cr#3\crcr}\vss}%
                  }%
               }%
            }%
         \else#4\fi
      }%
   }%
\newif\ifletterhead\letterheadtrue
\newif\ifstreetaddress
\newif\ifwindowenvelope
% review all of the \letterto's by typesetting them plus
\def\p@genumberletter{%
   \p@gebanner{\l@tterdate}{}{Page\qquad\numorroman\p@gecount}%
   }%