Connecting groups of beamed notes with a single beam

Groups of beamed notes can be connected with a settable number of beams using the stemRightBeamCount and stemLeftBeamCount properties.

\version "2.24"

%% http://lsr.di.unimi.it/LSR/Item?id=2

\relative c'' {
  c32[ c c  
  \set stemRightBeamCount = #1
  c32
  \set stemLeftBeamCount = #1
  c32 c c c]
}