5-- 4+ 3+ 3 3 3 5+ 4+ 4-- 6- 9 5- 4+ 3+ 3 3 3 5- 4- 4+ 6-- 9 4---- 4 4+# 5+ 5 5 9 3- 4+ 4 4- 4 0 4-- 4-# 6+
[+]是按上 ; [ - ]是按下