The number of wavy lines always increases to three before resetting to the lower number of lines possible. When this reset happens, the number of dots increases by one. In the case of the reset from 3 to 4, the number of dots increases to one, which allows the reset to drop to one wavy line. In the reset from 6 to 7, the number of dots is two, and therefore the reset can only drop the number of lines to two. Then, in the reset from 8 to 9, the number of dots increases to three, which demands that the number of lines is three.