skipTypesetting withing multiple note groups

[Kieren Richard MacMillan]

[ Mac OS X 10.2.8;  Lilypond 2.0.1 ]

Hello, all --

If I have multiple note groups, how do various Score.skipTypesetting 
values work/interact? [Example included below.]

Thanks,
Kieren.
_____________________

notesA = \notes
{
    \property Score.skipTypesetting = ##t
    a b c d |
    \property Score.skipTypesetting = ##f
    a b c d |
}

notesB = \notes
{
    \property Score.skipTypesetting = ##f
    e f g a |
    \property Score.skipTypesetting = ##t
    e f g a |
}

\score
{
    << \notesA \notesB >>
}