seperated stems

Hello, I want to write some chords, played with both hands, in one staff. To indicate that it's played with two hands, I want to write some of the notes with stem and beam up and some other down. The excerpt below combines both chord with one stem and one beam. How do I get one beam above

Re: seperated stems

like this: \version 2.10.4 \include deutsch.ly \score { \relative c'' { \repeat unfold 8 { {c' e a8} \\ {c, e a8} } } } cheers D. On