COMMENT ⊗   VALID 00002 PAGES
C REC  PAGE   DESCRIPTION
C00001 00001
C00002 00002	\chpar0←'77777777
C00003 ENDMK
C⊗;
\chpar0←'77777777
S $U↑A↓{B↑X↓Y\ddt}\ddt$ E

%A \up{\mup{\Xscr\sub 1\ddt}{\Xscr\sub 2\ddt}\ddt}{\Yscr\ddt} \ddt
% Then \ddt \up{\Xscr}{\mup{\Yscr\sub 1}{\Yscr\sub 2}} \ddt
% \par \ddt