Yep, you’ve interpreted and answered correctly. I’ll have a tinker shortly.
Thanks for all your help on this.
I’ve just deleted the hint for now. I may return to it later but this does the job. Thank you.
Here’s a link to a working tiddler!
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Very nice site!
I like the way freelinks work here. Clearly in your field, the resulting texture of interlinkage is even denser than in my field. I can imagine your students really appreciate that they can double-check the meaning of any concept encountered along the way.
Also, RTFQ 
I may need to borrow that…