manual beaming in a triplet or sextuplet

[Luc]

manual beaming in a triplet or sextuplet:
how can the 16th beams be grouped corresponding to the second measure? 
the manual beaming does not seem to work here

\version "2.11.22"

\relative c' {  
  \time 3/4
  \times 4/6 { c 8       d 16 d e e  }
  \times 4/6 { c 8      [ d 16 d e e ] }
  \times 2/3 { c 8 [ d 16 d e e ] }  
  | 
  \break 
  c 8 [ d 16 d e e ]  
  r 4.
  |
}

Thanks for any suggestions!
Luc