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

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

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