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Two five letter words typically require the measurement of over 6 million distances 

The results are very sensitive to small changes in the method. 

If one uses the mathematically natural square root in a distance, their results would be worse by a factor of 92 

Dropping obsolete forms of 15 and 16 decrease probability by a factor of 5 

When Haralick redid the method (but used what I believe is flawed data), the probability dropped from 1 in 62,500 to 1 in 400 