----------------------------------------┌-----------------------------------┐
.
------------------------------------------__05 chiffres = 10chiffres
.
------------------------------------------__10 chiffres = 15 chiffres
.
------------------------------------------__15 chiffres = 20 chiffres
.
------------------------------------------__ 20chiffres = 25 chiffres
.
------------------------------------------__ 25 chiffres = 30chiffres
.
-----------------------------------------------------__ eCt . . .
.
----------------------------------------└-----------------------------------┘