This is TeX, Version 3.1415 (C version 6.1) (format=latex 95.1.4)  13 MAR 1995 14:45
**present.tex
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LaTeX2e <1994/12/01> patch level 1
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Document Class: article 1994/12/09 v1.2x Standard LaTeX document class
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LaTeX Info: Redefining \cal on input line 455.
LaTeX Info: Redefining \mit on input line 456.
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LaTeX Font Info:    ... okay on input line 8.
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LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 8.
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LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 8.
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LaTeX Font Info:    External font `cmex10' loaded for size
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LaTeX Font Info:    External font `cmex10' loaded for size
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LaTeX Font Info:    Try loading font information for U+msa on input line 11.

(/usr/gnu/tex/inputs/fd/Umsa.fd
File: Umsa.fd 1994/10/17 v2.2d AMS font definitions
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LaTeX Font Info:    Try loading font information for U+msb on input line 11.
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! Undefined control sequence.
\math@cr@@@align ...quation}\else \iftag@ \df@tag 
                                                  \fi \fi \global \@eqnswtru...
l.24 \end{align*}
                 
? !dv
Type <return> to proceed, S to scroll future error messages,
R to run without stopping, Q to run quietly,
I to insert something, E to edit your file,
1 or ... or 9 to ignore the next 1 to 9 tokens of input,
H for help, X to quit.
? 
! Undefined control sequence.
\math@cr@@@align ...quation}\else \iftag@ \df@tag 
                                                  \fi \fi \global \@eqnswtru...
l.30 \end{align*}
                 
? 
[1

] (present.aux) ) 
Here is how much of TeX's memory you used:
 820 strings out of 10950
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 14 hyphenation exceptions out of 607
 26i,9n,24p,224b,154s stack positions out of 300i,40n,60p,3000b,4000s

Output written on present.dvi (1 page, 2312 bytes).