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

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

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