Irregular shapes may also be chosen so as to accommodate {TAIL ~ features}, such as external fittings or {HEAD ~ fluid control devices} 
Irregular shapes may also be chosen so as to accommodate { TAIL ~ features } , such as external fittings or { HEAD ~ fluid control devices }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD