In {TAIL ~ a preferred embodiment}, {HEAD ~ the apparatus} a floating device however it does not have to be 
In
In { TAIL ~ a preferred embodiment } , { HEAD ~ the apparatus } a floating device however it does not have to be
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH