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Help with homebrew sheet- unique spellcasting rule

Hey there. I'm making a homebrew tabletop system for my friends and would like some help in making my spellcasting idea a reality. In theory, a character each knows five spell focuses and at least one power word, and they can combine these two to create new and interesting spells. Right now, the "cast spell" button executes the roll command '/me casts a spell with power word @{pword} and focus @{focus}.' The @{focus} variable is easy, since there are only five possibilities for it, but each character is going to know different power words than each other. How can I create a field that will track each unique power word I add for each different character and submit the appropriate value when called? Thanks for any and all help you can give.
Make an attribute that is the power word query for the individual player. For example, Player A's power word query might be ?{Power Word|One|Two|Three}, You could take this a step further and put the individual words into their own attributes and Player A's power word query could be ?{Power Word|@{pw1}|@{pw2}|@{pw3}}; however, you would have to know how many power words the character knows.