When {HEAD ~ y} deviates from {TAIL ~ the range} of from greater than 10 to smaller than 60, the resulting alloy becomes brittle during casting and thus cannot be used as a hydrogen permeable alloy 
When { HEAD ~ y } deviates from { TAIL ~ the range } of from greater than 10 to smaller than 60 , the resulting alloy becomes brittle during casting and thus can not be used as a hydrogen permeable alloy
OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH