COMMENT ⊗   VALID 00002 PAGES
C REC  PAGE   DESCRIPTION
C00001 00001
C00002 00002	\input basic
C00004 ENDMK
C⊗;
\input basic
\output{\save0\page\advcount0}\eject
\fullpagetrace
\vsize 500pt
\topskip 171pt plus 1pt minus 10pt
\botskip 172pt plus 1pt minus 10pt
\topsep{\vskip 81pt plus 1pt minus 10pt}
\botsep{\vskip 82pt plus 1pt minus 10pt}
\def\t#1{\topinsert{\vskip #1pt plus 1pt minus 10pt}\penalty0}
\def\b#1{\botinsert{\vskip #1pt plus 1pt minus 10pt}\penalty0}
\def\tester{
\noindent
a\t1\b1\par
\t2\b2\t3\b3\t4\b4
b\t5\b5\par
\t6\b6\b7\b8\b9
c\t0\par
\penalty0\null\penalty1000\vskip 400pt plus 1pt\penalty0\null
\penalty1000\vskip 300pt plus 1pt\penalty0\null
\penalty1000\vskip 300pt plus 1pt\penalty0\null
\penalty1000\vskip 375pt plus 1pt\penalty0\null
\penalty1000\vskip 375pt plus 1pt\penalty0\null
\penalty1000\vskip 375pt plus 1pt\penalty0\null
\penalty1000\vskip 300pt plus 1pt\penalty0\null
\penalty1000\vskip 300pt plus 1pt\penalty0\null
\t7\t8\t9
\penalty1000\vskip 300pt plus 1pt\penalty0\null
\eject\eject}
\tester