The Henry Classification System for fingerprint grouping.

Each of the fingers is assigned an index as follows:

• Left Pinky = 10
• Left Ring = 9
• Left Middle = 8
• Left Index = 7
• Left Thumb = 6
• Right Pinky = 5
• Right Ring = 4
• Right Middle = 3
• Right Index = 2
• Right Thumb = 1

Fingers can have three types of patterns - Arches, Loops and Whorls. If a finger contains a Whorl pattern it is given a score based on its index:

• 10 and 9 have a score of 1.
• 8 and 7 have a score of 2.
• 6 and 5 have a score of 4.
• 4 and 3 have a score of 8.
• 2 and 1 have a score of 16.

The grouping ratio for the fingerprints is: N / D
where the numerator N = 1 + Score for even indices,
and the denominator D = 1 + Score for odd indices.

There are up to 1024 primary groupings available through this method.

####Usage: f = Fingerprint()
A = ['W', 'L', 'A', 'L', 'W', 'W', 'A', 'L', 'A', 'W']
f.Henry(A)
[6, 21]