 A line which does not have "From"
as its first word is uninteresting to us so we skip it.<br />
<br />
The program as modified runs successfully so perhaps it is correct. Our
guardian statement does make sure that the <tt>words[0]</tt> will never fail, 
but perhaps it is not enough. When we are programming, we must always be 
thinking, "What might go wrong?".<br />
</font><div align="left"><font color="black"><b>Exercise&nbsp;2</b>&nbsp;&nbsp;<em>
Figure out which line of the above program is still not pro