20' × 25' with a 10' × 12' return

15' × 20' with a 8' × 12' return

12' × 18' with a 6' × 10' return

6 × 8 m with a 3 × 4 m return

5 × 7 m with a 2.5 × 3.5 m return

4 × 6 m with a 2 × 3 m return