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Always room for improvement. There is no need to pass the number of open lambdas between each iteration when that can be easily checked during each iteration. Now there is no need to pass a 2 item list, we can just converge on the input string itself. The true condition in the above version is also a bit suspect, this is cleaner.
paste:{value{$[(“”~r:read0 0)and not sum 124-7h$x inter”{}”;x;x,` sv enlist r]}/[“”]}
@SJT, happy to write this up for Awesome Q.