{TAIL ~ The filler composition} may contain {HEAD ~ a thickening/thixotropic agent}, such as silanized pyrogenic silica 
{ TAIL ~ The filler composition } may contain { HEAD ~ a thickening / thixotropic agent } , such as silanized pyrogenic silica
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH