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