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

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

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