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Now, if I tell you the point value of every letter.
I'm creating a dictionary with the point values.
I'm using underscore to indicate the blank, but we won't be dealing with blanks yet.
Now, I'd like you to write the function wordscore for me,
which takes a word--a sequence of letters--and tells me the total score for it
according to the points of each letter,
and it's not dealing with any bonuses on the board--
any double letters, or triple words, or anything.