Three numbers per set.  The question is, what is the rule for the set to be valid?  What pattern is acceptable?<br />
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So, determine what sets you would think are valid.  And then use the following form to submit your guesses.  It will evaluate your sets and tell you if they are valid or not.
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<form method=post>
	<input type='text' name='num1' size=2>
	<input type='text' name='num2' size=2>
	<input type='text' name='num3' size=2>
	<input name='test' type='submit' value='Test this set'>
</form>