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

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

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