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Variation on Iota
November 12, 2025 Several updates below! We just encountered the following real-life problem, which oddly, if memory serves, we have never encountered before: Given a list of items, find the location of each item in a list of lists of items. An example will make it clear: a← 'abc' 'de' '' 'fgha' w←'hafxd' a {...} w 3 0 3 4 1 So, it's just like Index Of ( ⍳), only we are looking a level deeper on the left for the existence of an item on the right.
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