In a piece with a double backslash to denote voices
\clef treble
\key c \major
\time 3/4
<< { d, g d g fs a | d, g d g }
\\
{ <b d> q <c d> |<b d> q }>>
The construct ends after beat 2, leaving the four eighth notes unbeamed. is there something in the manual beaming syntax that I can use to beam the four notes?