Moreover, {TAIL ~ frame time periods F1 F4} in {HEAD ~ turn} indicate one frame time period 
Moreover , { TAIL ~ frame time periods F1 F4 } in { HEAD ~ turn } indicate one frame time period
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH