\colspan and \rowspan
The upper left entry in this array extends into the second
column using \colspan. Note that entries are left
blank if they will be covered by the spanning entry.
\array{
\cellopts{\colspan{2}} x+y+z & & 5 & A & D \\
3 & 4 & \frac{x+1}{5} &
\cellopts{\rowspan{3}}
\frac{\frac{x+1}{5}}{\frac{x+5}{41}}
& c \\
\beta & \Gamma & \Theta & & 5001\\
7 & yjq & 9 & & 2001
}
More information on these commands may be found in
Sec. 7.2.3
of the WebTeX documentation.
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