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"lxx" is also used as a crossword clue. If that's what you saw, the answer is often seventy (7 letters).
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L__
Definitions
being ten more than sixty
Word origin
From Medieval Latin LXX, a calque of Koine Greek οἱ Ο′ (hoi O′, “the 70”), used as an abbreviated title for the Septuagint, q.v.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
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