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

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

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