Lots of words have special programming meanings. “print_r” means something special in PHP. “wend” means something special in Visual Basic 6 or below. Perhaps “combine” means something in the programming language I’m writing in, above. Or perhaps it’s just a comment.

The key to solving my puzzle is first to determine the nature of the programming language I’m writing in. Now that you have the answer and the question, perhaps you can solve it “the hard way”, but it’d certainly be easier to scour the internet and try to work out the rules of my language. It’s a published programming language, and the rules can be found online.

Once again, Jon, I’m impressed that you worked it out by hand. I used a computer to help me check I’d written it correctly.