[split] Word length autocorrelation

[Jorge_Stolfi]

[Fixed a bug in the program. The conclusion is the same, but more definite.]

"And then we must consider the need to squeeze words together as we get near the end of the line"
# average length = 3.80
# averages =  3.789  3.842
# variances =  3.730994  -0.035088  3.695906
# deviations =  1.9316  1.9225
# word length correlation = -0.009

"And then we must consider the needto squeezewords togehtheraswe getneartheendoftheline"
# average length = 7.70
# averages =  6.111  8.222
# variances =  16.361111  +20.472222  41.694444
# deviations =  4.0449  6.4571
# word length correlation = +0.784

The averages, variances and deviations are for the lengths of first word and second word of each pair.
The middle number in the "variances" line is the covariance.
The correlation is defined as covariance/sqrt(variance1 * variance2)