{HEAD ~ The rolling elements} may be arranged in {TAIL ~ one, two or more rows} as desired in the specific application 
{ HEAD ~ The rolling elements } may be arranged in { TAIL ~ one , two or more rows } as desired in the specific application
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH