Partcombine

[Nels Daily]

> I'm not top posting.

"Partcombine" function will not show the second voice in measure 11.
Here's the code:

\version "2.13.63-1"  % necessary for upgrading to future LilyPond versions.

hornthree = \relative c' {
\time 2/4
        R2*2 r8 e16 r r8 e16 r r8 cis16 r r8 e16 r 
R2*2 r8 e16 r r8 e16 r r8 d16 r r8 e16 r R2*6
}

hornfour = \relative c' {
\time 2/4
        R2*10
%% These notes don't appear!!! %%
r8 b~ b b~ b b~ b b~ b b~ b b~ b b~ b b
}

\score {
 
                << { 
                        \partcombine \hornthree \hornfour 
                } >>

}