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Why we consult reference books of course (2,2,4)

Ross

I believe the answer is:

to be sure

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'of course' is the definition.
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(Other definitions for to be sure that I've seen before include "Undoubtedly" , "Admittedly" , "Of course, certainly" , "I admit" , "Without doubt" .)

I've seen this clue in The Globe and Mail.
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