6 " Hara-kiri staves are suppressed if they are empty. This
7 example really contains three tab staves, but as it progresses, empty ones
8 are removed: this example has three staves, but some of them
9 disappear: note how the 2nd line only has the bar number 2. (That the
10 bar number is printed might be considered a bug, however, the scenario
11 of all staves disappearing does not happen in practice.)"