Examples:
'SUNDAY' --> 6
'MONDAY' --> 6
'TUESDAY' --> 7
'WEDNESDAY' --> 9
'THURSDAY' --> 8
'FRIDAY' --> 5
'SATURDAY' --> 8
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since friday maps to 5, the answer should be:
floor((sum(lower(x))-40)/100)
According to the description 'FRIDAY' should return the value '5' but it's actually '6'. Please correct the description, my brain almost broke trying to figure out why it's supposed to be '5' :)