The long s, ſ , also known as the medial s or initial s, is an archaic form of the lowercase letter s , found mostly in works from the late 8th to early 19th centuries.It replaced one or both [a] of the letters s in a double-s sequence (e.g., "ſinfulneſs" for "sinfulness" and "poſſeſs" or "poſseſs" for "possess", but never "poſſeſſ"). [1] More @Wikipedia
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