EVIL ROBOT HAS ALMOST COMPLETED HIS EVIL PLAN FOR THE TOTALDESTRUCTION OF THE HUMAN RACE. HE HAS TO PICK TWO CHEMICALS,WHICH ARE CALLED A AND B AND WHICH ARE CURRENTLY STORED INCONTAINERS A AND B RESPECTIVELY. THE EVIL ROBOT IS EQUIPPED WITH APROPOSITIONAL PLANNING SY STEM THAT ALLOWS HIM TO REASON ABOUTTHE LOCATIONS OF PARTICULAR THINGS AND ABOUT MOVING A THINGFROM ONE PLACE TO ANOTHER. THE EVIL ROBOT INITIALLY LOCATED ATTHE CENTER OF A CIRCULAR COURT $($X$).$ EACH SLIDE IN THE COURT ISIDENTIFIED BY BOTH ITS ANGULAR LOCATION $($Q$)$ AND CIRCULARPARTITION NUMBER $($I$).$ ALL HE HAS TO DO NOW IS MIX CHEMICALS A AN DB TOGETHER INTO THE GOAL CONTAINER LOCATED AT X$(135,3)$CORRESPONDING TO Q$=135$ AND CIRCULAR PARTITION NUMBER $(3).$ WHENTHE ROBOT REACHES A CHEMICAL STATE IT PICKS IT UNDER CONDITIONTHAT THE ROBOT COULDN'T PICK CHEMICAL B UNTIL PICKING CHEMICAL AFIRST. THERE IS AN ATTACKER STATE AT X$(180,2).$ THE ATTACKER HAS ANATTACK EFFECT AT ANY LOCATION ADJACENT TO IT AT THE SAME ANGULARLOCATION AND AT THE SAME CIRCULAR PARTITION NUMBER.