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

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

*GRAMMAR*
wif -> YELLOW 
 lug -> BLUE 
 fep -> RED 
 zup -> PURPLE 
 x1 blicket x2 -> [x1] [x2] 
 x1 tufa u1 -> [u1] [x1] [u1] 
 u1 dax u2 -> [u1] [u2] 
 u1 x1 -> [u1] [x1] 
 