R1/8(PT1/8)×R1/4(PT1/4)
R1/4(PT1/4)×R3/8(PT3/8)
R3/8(PT3/8)×R1/2(PT1/2)
G1/8(PF1/8)×G1/4(PF1/4)
G1/4(PF1/4)×G3/8(PF3/8)
G3/8(PF3/8)×G1/2(PF1/2)