Finiding nodes filtered by attribute

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All,
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1)How would I do a match to find all <td> tags that don't have an attribute named class?
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2)How would I do a match to find all <td> tags that don't have a class attribute equal to "a" or have no class attribute at all?
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3)How would I do a math on all <td> tags that don't have any attributes?
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Thanks,
Rechell
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