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

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

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