What does this syntax: kaminoku: '$five <br> $sevenFive(. | ...[3])', do? I haven't been able to find the (. | ...[3]) type notation in the documentation...thanks!

So that just means add a full-stop (.) or an ellipses (...), but make the latter happen three times as often. No special meaning for any of the dots. You can read about this kind of weighting here: https://observablehq.com/@dhowe/riscript#weightedChoice.

ah, ok, those are literals! thanks