This is TeX, WAITS Version 0.97 (format=plain 83.4.16) 18 MAY 1983 16:12 **tmp (TMP.TEX[TEX,DEK] ! Missing control sequence inserted. <inserted text> \inaccessible <to be read again> $ <template> $ \endtemplate \Let ->\iffalse {\fi \let \\ =\cr \iffalse }\fi \align ->\Let \vbox \lb \halign \lb $##$&$##$\cr l.12 $$ \align a&\align x&y\\z&w\endalign\\c&d\endalign$$ ? e No output file.