*SUPPORT*
IN: lug zup wif zup gazzer lug OUT: GREEN YELLOW RED YELLOW GREEN
IN: wif fep dax OUT: PURPLE RED
IN: zup OUT: YELLOW
IN: wif fep wif OUT: RED RED
IN: lug tufa zup OUT: GREEN YELLOW
IN: lug tufa dax OUT: GREEN PURPLE
IN: zup tufa lug OUT: YELLOW GREEN
IN: dax tufa wif OUT: PURPLE RED
IN: wif OUT: RED
IN: wif zup tufa lug OUT: RED YELLOW GREEN
IN: dax OUT: PURPLE
IN: dax wif gazzer zup OUT: PURPLE RED YELLOW
IN: zup tufa zup OUT: YELLOW YELLOW
IN: zup tufa wif OUT: YELLOW RED

*QUERY*
IN: zup fep dax OUT: PURPLE YELLOW
IN: zup gazzer lug OUT: YELLOW GREEN
IN: lug wif tufa lug OUT: GREEN RED GREEN
IN: lug dax zup tufa dax OUT: GREEN PURPLE YELLOW PURPLE
IN: lug OUT: GREEN
IN: zup wif tufa dax OUT: YELLOW RED PURPLE
IN: wif fep lug OUT: GREEN RED
IN: dax fep dax OUT: PURPLE PURPLE
IN: zup gazzer wif OUT: YELLOW RED
IN: dax fep wif OUT: RED PURPLE

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