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

*QUERY*
IN: wif zup dax wif OUT: BLUE BLUE RED
IN: wif tufa zup kiki zup OUT: RED RED BLUE
IN: wif zup kiki fep kiki lug OUT: YELLOW PURPLE BLUE RED
IN: zup lug tufa fep kiki lug kiki zup OUT: RED YELLOW RED PURPLE YELLOW
IN: fep OUT: PURPLE
IN: lug OUT: YELLOW
IN: fep zup wif zup OUT: PURPLE RED BLUE RED
IN: wif dax fep OUT: PURPLE BLUE
IN: fep tufa lug OUT: YELLOW PURPLE
IN: zup kiki wif OUT: BLUE RED

*GRAMMAR*
fep -> PURPLE 
 wif -> BLUE 
 zup -> RED 
 lug -> YELLOW 
 u1 tufa u2 -> [u2] [u1] 
 x1 dax u1 -> [u1] [x1] 
 x1 kiki u1 -> [u1] [x1] 
 u1 x1 -> [u1] [x1] 
 