Rearrange the following trigrams. What word is missing?
ACE AIN AKI ALE ARE AYI AYI AYT AYT AYW CET CEY CKI COL DAK DAY DTH DTO DTO EAD EAR EDT EIN EIN EIN EMO EMO ERD ERD ERE ERI ERI EST EST ETW EUP EUP GAL GAL GHT GHT HAT HEA HER HTP HTP HTP HTP HTP IDA IED IED IED IGH ING INI ITS ITS ITS ITS ITS IWO KEU KID KID KIN KIN LAC LAC LAC LAC LAC LEM LOU MON MYH NGA NIN NMY NYE OCO OKE ONY OSA OUR PLA PLA PSU RDA RIE RIE RIG RIG RIG RIG RIG RSI SAY SAY SIN STE SUC SUC TER THA THA TIS TOS TOS TOS TPL TRI TSR TWO TYO TYO UCK UPS UTR UTR WAS WHA WOK WOK YES YIW YTR