 L R8= 0;J S; W:I RZ& 16J S;P;J W;S:L R8=R8+1;P;I R8=1 J A;I R8=2 J B;I R8=3 J C;L R8=0 J D;A: P; A 1,(34,1)(35,1)(36,1)(37,1);P;P;P;L RZ=0:J W;B: P; A 1,(38,1)(39,1)(40,1)(41,1);P;P;P;L RZ=0;J W;C: P; A 1,(40,1)(39,1)(38,1)(37,1);P;P;P;L RZ=0:J W;D: P; A 1,(36,1)(35,1)(34,1)(33,1);P;P;P;L RZ=0;J W;?