dvorak layout generator for 9 keys phones.

Default data.txt is a piece written by Alfred de Musset called On ne badine pas avec l'amour. It has been extracted from wikisource.

Let's suppose that there is only one swap that improve the keyboard. There is 25*25 possible swaps. If we want that this swap has a probability of at least 0.95 to be made once, then we have to compute 1,871 swaps. Indeed, we want, X being the good swap :

P(X > 0) > 0.95
X ~ B(n, 1/625), thus
1 - P(X = 0) ≥ 0.95
P(X = 0) ≤ 0.05
(624/625)^n ≤ 0.05
n ln(624/625) ≤ ln 0.05
n ≥ (ln 0.05)/ln(624/625)
n ≥ 1870.9