However, this leads to the problem of {HEAD ~ higher system installation time} and {TAIL ~ costs} and larger space requirements of overall system 
However , this leads to the problem of { HEAD ~ higher system installation time } and { TAIL ~ costs } and larger space requirements of overall system
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH