This is CTeX, NeXT Version 3.141 (format=splain 94.2.9)  6 FEB 1995 20:15
**distlrn
(distlrn.tex
SliTeX Version 2.09 <25 March 1992>
! Undefined control sequence.
<argument> ...r \@visibletrue \fi }\fi \@currsize 
                                                  \@currfont \ignorespaces 
\@mmodetest ...math mode has been ignored}\else #1
                                                  \fi 
\slide ...bw \gdef \@slidesw {T}\else \@color {#1}
                                                  \if@visible \gdef \@slides...
l.3 \begin{slide}{}
                   
? x
 
Here is how much of TeX's memory you used:
 3 strings out of 16941
 29 string characters out of 161993
 23895 words of memory out of 262141
 2038 multiletter control sequences out of 9500
 27487 words of font info for 104 fonts, out of 72000 for 255
 14 hyphenation exceptions out of 607
 5i,0n,5p,35b,14s stack positions out of 300i,40n,60p,3000b,4000s
No pages of output.