{HEAD ~ second detection} means for detecting {TAIL ~ the operation amount} of the clutch operation member; and 
for detecting
{ HEAD ~ second detection } means for detecting { TAIL ~ the operation amount } of the clutch operation member ; and
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH