First pass prompt, when some numeral to time, according to the right side button, under can appear a green light, but certainly not necessarily is the relative that numeral is accurate, tries to find solution to let all lamps change green, went through customs. The second pass, falls down does the digital where corresponding position, refer to on the small paper the prompt to go through a strategic pass. The first pass numeral is stochastic. After the second pass key is puts the numeral causes each line of, each row three numerals to add together = 15 (first line is 9, second line is 3, third line is 6, fourth line is 0), then the input prompt gives numeral (916,312). The third pass is upward dials the switch, causes following display monitor the numeral to be equal to prompt to the numeral (fortunately, this is not stochastic), the first row chooses 4th, the 2nd row chooses 2, 4, the 3rd row chooses 1, 2, 4. Finally chooses the red line.