4 texidoc = " print lesson sheets that contain blank lines and just portions of blank lines."
8 blanknotes = { \property Voice.NoteHead
9 \override #'transparent = ##t
11 \override #'transparent = ##t }
12 unblanknotes = { \property Voice.NoteHead
13 \revert #'molecule-callback
15 \revert #'molecule-callback }
20 \blanknotes e4 f4 \unblanknotes