{HEAD ~ Tests} have been effected with manganese hydroxide Mg2 and {TAIL ~ other divalent metal ion hydroxides} such as iron, cobalt, nickel, copper and zinc are believed to be suitable 
effected with
{ HEAD ~ Tests } have been effected with manganese hydroxide Mg2 and { TAIL ~ other divalent metal ion hydroxides } such as iron , cobalt , nickel , copper and zinc are believed to be suitable
HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH