recomments

[Alexandre Zamulin <zam@cs.usm.my>]

Dear Don, Hubert,

Please disregard my comment for page 49.

My comment for pages 59-60 should be the following:

It seems to me that there should be

for $\bar{XF}' \in \{\bar{TF}',\bar{PF}'\}$

instead of

for $XF\in\{\TF,\PF\}$.  

Regards,

Alexandre.

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Alexandre Zamulin                              e-mail: zam@cs.usm.my
School of Computer Science                     fax, phone:+60 4 6573335
University Sains Malaysia
11800 Penang, Malaysia
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