The method 12 comprising configuring the data structure to include data representing a symbol kind which, if included in a winning outcome set {HEAD ~ S} is not removed from {TAIL ~ the display} 
The method 12 comprising configuring the data structure to include data representing a symbol kind which , if included in a winning outcome set { HEAD ~ S } is not removed from { TAIL ~ the display }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL