Given a word, compute the scrabble score for that word.

You'll need these:

Letter                           Value
A, E, I, O, U, L, N, R, S, T       1
D, G                               2
B, C, M, P                         3
F, H, V, W, Y                      4
K                                  5
J, X                               8
Q, Z                               10

"cabbage" should be scored as worth 14 points:

• 3 points for C
• 1 point for A, twice
• 3 points for B, twice
• 2 points for G
• 1 point for E

And to total:

• 3 + 2*1 + 2*3 + 2 + 1
• = 3 + 2 + 6 + 3
• = 5 + 9
• = 14

• You can play a double or a triple letter.
• You can play a double or a triple word.

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To raise a message with an exception, just write it as an argument to the exception type. For example, instead of raise Exception, you shold write:

raise Exception("Meaningful message indicating the source of the error")

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