... three modes for air pressure; Mode I, from “1” to “8”; Mode II, from “8” to “1”; Mode III, “1” and “2” first ... , then “2” and “3” followed with “7” and “8”; Mode IV, “7” and ... first, then “6” and “7” followed with “1” and “2”; Mode V, “1” and “8” first, then “2” and “7” ... followed with “4” and “5”; Mode VI, “4” and “5” first, then “3” and “6” ...