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