static Grob *first_head (Grob *me);
static Grob *get_rest (Grob *me);
static void set_stem (Grob *me, Grob *);
static Grob *first_head (Grob *me);
static Grob *get_rest (Grob *me);
static void set_stem (Grob *me, Grob *);
static void add_head (Grob *me, Grob *);
static bool has_rests (Grob *me);
static Grob *dot_column (Grob *me);
static void add_head (Grob *me, Grob *);
static bool has_rests (Grob *me);
static Grob *dot_column (Grob *me);