Thinking of the rolodex slider motif of some address books, but ALSO the widget to type a name in an address book, and it jumps to the first location with it (or where it would be, unlike Search Within, never a "no results" state). See search-within for a contrasting widget
cross reference Location Within as a way to indicate... or as a counter, where the rolodex letter thing is similar, but not identical???
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