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

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

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