*SUPPORT*
IN: zup dax zup tufa OUT: RED RED RED RED
IN: lug dax lug dax kiki OUT: GREEN GREEN BLUE
IN: kiki zup dax wif OUT: BLUE RED YELLOW
IN: wif lug wif OUT: YELLOW GREEN YELLOW
IN: wif OUT: YELLOW
IN: zup tufa tufa OUT: RED RED RED RED
IN: wif lug tufa OUT: YELLOW GREEN YELLOW GREEN
IN: lug zup OUT: GREEN RED
IN: wif tufa OUT: YELLOW YELLOW
IN: kiki OUT: BLUE
IN: kiki dax kiki tufa OUT: BLUE BLUE BLUE BLUE
IN: wif dax wif tufa tufa OUT: YELLOW YELLOW YELLOW YELLOW YELLOW YELLOW YELLOW YELLOW
IN: zup kiki OUT: RED BLUE
IN: lug zup dax wif OUT: GREEN RED YELLOW

*QUERY*
IN: wif zup lug tufa OUT: YELLOW RED GREEN YELLOW RED GREEN
IN: lug gazzer wif tufa OUT: YELLOW GREEN YELLOW GREEN
IN: zup OUT: RED
IN: lug OUT: GREEN
IN: kiki dax wif dax zup lug tufa OUT: BLUE YELLOW RED GREEN BLUE YELLOW RED GREEN
IN: kiki tufa OUT: BLUE BLUE
IN: lug lug tufa tufa OUT: GREEN GREEN GREEN GREEN GREEN GREEN GREEN GREEN
IN: lug dax wif gazzer wif tufa OUT: YELLOW GREEN YELLOW YELLOW GREEN YELLOW
IN: wif dax lug dax kiki OUT: YELLOW GREEN BLUE
IN: lug zup tufa OUT: GREEN RED GREEN RED

*GRAMMAR*
zup -> RED 
 wif -> YELLOW 
 lug -> GREEN 
 kiki -> BLUE 
 x1 tufa -> [x1] [x1] 
 x1 gazzer x2 -> [x2] [x1] 
 u1 dax x1 -> [u1] [x1] 
 u1 x1 -> [u1] [x1] 
 