As an example, {HEAD ~ the inventors} achieved {TAIL ~ single crystal growth} of clathrate I Na8Si46 and clathrate II Na24Si136 
achieved
As an example , { HEAD ~ the inventors } achieved { TAIL ~ single crystal growth } of clathrate I Na8Si46 and clathrate II Na24Si136
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH