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________ though it seemed to many mathematicians, the honeycomb conjecture, posited in the first century BCE, eventually yielded to the efforts of Thomas C. Hales, who presented a proof of it in 1999.
|Question 5Verbal
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Which choice completes the text with the most logical and precise word or phrase?
Irreproachable
A
Unequivocal
B
Insuperable
C
Ineluctable
D