-\version "2.12.0"
+\version "2.19.21"
\header {
texidoc = "Note heads in collisions should be merged if
they have the same positions in the extreme note heads.
-\relative c'' {
- c4
+\relative {
+ c''4
<< { c4 d4 <c d>8 <c d> <c d> } \\ { c4 c <a b>8 <b c> <c d>8 } >>
}