Statistics for harry potter- secret phrase

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Hint	Answer	% Correct
harry's cloak of	invisibility	98%
harry's friend last name longbottom	neville	94%
harry's friend dean	thomas	94%
headmaster of hogwarts	albus dumbledore	93%
second eldest weasley brother	charlie weasley	93%
harry, nagini, diary	horcrux	93%
harry's aunt	petunia dursley	93%
the half blood prince	severus sanpe	93%
neville's toad	trevor	89%
lily's maiden name	evans	86%
surname of augusta	longbottom	78%
wandmaker garrick	olivander	73%
marietta's surname	edgecombe	64%
snape teaches harry in his fifth year	occlumency	58%
the second best grade for o.w.l exams	exceeds expectations	57%
secret phrase	i open at the close	54%