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

*QUERY*
IN: wif OUT: BLUE
IN: zup dax dax gazzer wif OUT: RED YELLOW YELLOW BLUE
IN: wif kiki dax OUT: BLUE YELLOW
IN: dax kiki wif OUT: YELLOW BLUE
IN: fep blicket dax gazzer dax OUT: GREEN YELLOW YELLOW
IN: dax gazzer dax OUT: YELLOW YELLOW
IN: fep gazzer fep OUT: GREEN GREEN
IN: dax gazzer wif OUT: YELLOW BLUE
IN: wif blicket zup kiki dax OUT: BLUE RED YELLOW
IN: zup gazzer zup OUT: RED RED

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