in column 1, `<font color="#82140F"><code>y</code></font>' in column 2 until blank-line found.
Only the first two numbers on each line will be read; any extra numbers
(or words) on the line will be ignored.
<p>
<li> `<font color="#82140F"><code>read columns * y * * x</code></font>'
Read `<font color="#82140F"><code>x</code></font>' in column 5, `<font color="#82140F"><code>y</code></font>' in column 2.  The `<font color="#82140F"><code>*</code></font>' character
is a spacer.  It instructs Gri to skip the fi