{HEAD ~ The hydrogen permeable alloy} 1, wherein the fourth element comprises {TAIL ~ Cu}, and 
{ HEAD ~ The hydrogen permeable alloy } 1 , wherein the fourth element comprises { TAIL ~ Cu } , and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH