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Verbal·Craft and Structure·Words in Context
hard
       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.
Which choice completes the text with the most logical and precise word or phrase?
A
Irreproachable
B
Unequivocal
C
Insuperable
D
Ineluctable