A. Solo, with a maximum power of at least 25 kW (33 bhp)
B. Solo, with a maximum power of at least 11 kW (14.6 bhp)
C. Fitted with a sidecar, and with a maximum power of at least 35 kW (46.6 bhp)
D. Solo, with a maximum power of at least 40 kW (53.6 bhp)
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