EV1742
Prime by Arcadia
Solution
Putting the words to lights – crossword clues explained in plain English
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The name Arcadia immediately brings to my mind a shop in St. Michael’s Street, Oxford.
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I gave Claude as much information as I could glean from the preamble: “In a themed crossword puzzle, we are told that we must highlight cells in a block in the completed grid which cryptically represent a puzzle referred to by an entry in the Oxford Dictionary of Quotations. What might this puzzle be?” Good luck with that, matey…