vector<Break_position> chunk_list (vsize start, vsize end);
Line_division system_count_bounds (vector<Break_position> const &chunks, bool min);
void line_breaker_args (vsize i,
vector<Break_position> chunk_list (vsize start, vsize end);
Line_division system_count_bounds (vector<Break_position> const &chunks, bool min);
void line_breaker_args (vsize i,