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

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

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