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Clue: "Ominous request from a teacher ... or a hint to the first words (and following letters!) of 17-, 26- and 43-Across"

"Ominous request from a teacher ... or a hint to the first words (and following letters!) of 17-, 26- and 43-Across" is a New York Times crossword puzzle clue that we have seen 1 time.
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