In individual cases, {TAIL ~ the strength} can be increased by admixing {HEAD ~ graphite} with the powder, although even this should be avoided as far as possible 
In individual cases , { TAIL ~ the strength } can be increased by admixing { HEAD ~ graphite } with the powder , although even this should be avoided as far as possible
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH