+\new PianoStaff \with { \consists #Span_stem_engraver } <<
+ \new Staff \fixed c' <<
+ \new Voice {
+ \voiceOne f e
+ \crossStaff
+ \once\override NoteColumn.force-hshift = #-0.8
+ f
+ \once\override NoteColumn.force-hshift = #-1.5
+ e
+ }
+ \new Voice {
+ \voiceTwo e f
+ \once\override NoteColumn.force-hshift = #0
+ \crossStaff e
+ \crossStaff f
+ }
+ >>
+ \new Staff {\clef bass g g e f }
+>>