Default combining rule

As stated earlier, the default combining rule is appropriate for only two scenarios:

If you want the description as a whole to be true only if ALL the descriptors are true, then set the Optional setting of all the descriptors in the description to false (the default setting).

In contrast, if you want the description as a whole to be true if AT LEAST ONE of the descriptors is true, then set the Optional setting of all of the descriptors in the description to true.

You should not use the default combining rule in any other scenario where you have multiple descriptors in one macro screen, unless you understand the rule and its implications thoroughly. For more information see The default combining rule for multiple descriptors in one macro screen.

Also, you should not set the Optional settings of multiple descriptors in one macro screen differently (some true, some false) unless you understand the rule and its implications thoroughly.