Question 1089430
.
There are many of them.


Of rules, I mean.


For example:


<pre>
<U>Rule 1</U>. No one number is multiple of 3.


<U>Rule 2</U>. All the numbers are less than 100.


<U>Rule 3</U>. All the numbers are less than 1000.


<U>Rule 4</U>. All the numbers are integer.


<U>Rule 5</U>. All the numbers are positive.
</pre>

And so on . . . 


Take anyone which you want.  Or invent your own.