This is TeX, WAITS Version 2.9 (preloaded format=plain 88.4.17)  30 APR 1988 16:32
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! Missing } inserted.
<inserted text> 
                }
<to be read again> 
                   $
p.4,l.23  ${\,$
               \\{save\_level} for a level boundary$\,\}$
? 
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Output written on ERRATA.DVI[TEX,DEK] (7 pages, 19656 bytes).