along to the continue-leftwards handler.
A **version 5** list encodes the kind of fold operation we're envisaging here, in
-the same way that v3 (and [v4](/advanced/#v4)) lists encoded the simpler fold operation.
+the same way that v3 (and [v4](/advanced/#index1h1)) lists encoded the simpler fold operation.
Roughly, the list `[5;4;3;2;1]` would look like this:
larger_computation
3. To extract tails efficiently, too, it'd be nice to fuse the apparatus developed
- in these v5 lists with the ideas from [v4](/advanced/#v4) lists.
+ in these v5 lists with the ideas from [v4](/advanced/#index1h1) lists.
But that also is left as an exercise.