- f1=28cm;f2=45cm{f_1} = 28cm;{f_2} = 45cm
- f1=45cm;f2=28cm{f_1} = 45cm;{f_2} = 28cm
- f1=85cm;f2=5cm{f_1} = 85cm;{f_2} = 5cm
- f1=5cm;f2=85cm{f_1} = 5cm;{f_2} = 85cm