-\version "2.1.7"
+\version "2.3.4"
\header {
texidoc = "Note heads are flipped on the stem to prevent collisions.
\paper { raggedright= ##t }
-\score { \notes \relative c''
- \context Thread {
+\score { \relative c''
+ \context Voice {
<g a c>4
<c d g a>
<c d e >