Size-of-unit brackets (Under 10 / 10-19 / 20-29 / 30-39 / 40-49 / 50-59 / 60-69 / 70-79 / 80-89 / 90-99 / 100-119 / 120-139 / 140-159 / 160-179 / 180-199 / 200-299 / 300-399 / 400-499 / 500-599 / 600-699 / 700-799 / 800-899 / 900-999 / 1,000 and over) — ~24 brackets