\version "2.11.34"

\score { 
<<
    \new StaffGroup << 
        \new Staff {c' d' e' f'}
        \new InnerStaffGroup <<
            \new Staff {c' d' e' f'}
            \new InnerStaffGroup <<
                \new Staff { e' f'}
                \new Staff { e' f'}
            >>
            \new Staff {c' d' e' f'}
        >>
    >>
>>

 \layout { raggedright = ##t}
}