*SUPPORT*
IN: dax fep tufa OUT: GREEN RED GREEN GREEN
IN: tufa tufa wif kiki OUT: GREEN GREEN YELLOW
IN: gazzer wif kiki OUT: PINK YELLOW
IN: gazzer wif tufa OUT: PINK GREEN
IN: gazzer zup kiki OUT: PINK YELLOW
IN: tufa wif gazzer OUT: GREEN PINK
IN: kiki OUT: YELLOW
IN: gazzer zup tufa OUT: PINK GREEN
IN: tufa zup kiki OUT: GREEN YELLOW
IN: kiki fep dax OUT: RED YELLOW RED RED
IN: tufa wif dax OUT: GREEN RED
IN: kiki wif gazzer OUT: YELLOW PINK
IN: kiki zup gazzer OUT: YELLOW PINK
IN: dax wif gazzer OUT: RED PINK

*QUERY*
IN: tufa gazzer kiki zup tufa OUT: GREEN PINK YELLOW GREEN
IN: tufa wif kiki OUT: GREEN YELLOW
IN: tufa fep tufa OUT: GREEN GREEN GREEN GREEN
IN: dax fep dax OUT: RED RED RED RED
IN: kiki fep tufa OUT: GREEN YELLOW GREEN GREEN
IN: kiki dax gazzer fep gazzer OUT: YELLOW RED PINK PINK PINK PINK
IN: dax zup gazzer OUT: RED PINK
IN: gazzer zup dax OUT: PINK RED
IN: dax OUT: RED
IN: tufa OUT: GREEN

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