Adding more than 5 fields in InfoPath Rules

It looks like InfoPath doesn’t allow more than 5 fields in a rule with “And” being greyed out after that. But you can add as many (at least I have added 35 fields) in a rule with below approach. In my scenario all my fields were named with numbers. But it works the same with any type of field.
Below are the instructions.

- Add the 5 fields(including 5th).
- On the last field, change it to “The expression". Copy the expression and type “and” or “or” and paste it.
- Now change the name of the field and so on add all the fields.