=2; W;B: I BC(0,1,15) J D; L RC=0; W;D: L R6=1;E: I C(R6)=-1 J F;L R6=R6+1;I C(R6)=-1 J G;L R6=R6+1;I C(R6)=-1 J H;L R6=R6+1;I C(R6)=-1 J I;L R6=R6+1;I C(R6)=-1 J J;L R6=R6+1;I C(R6)=-1 J K;L R6=R6+1;I C(R6)=-1 J L;L R6=R6+1;I C(R6)=-1 J M;L R6=R6+1;I C(R6)=-1 J N;L R6=R6+1;I C(R6)=-1 J O;L 