input:N1(3,1,100),N(2,1,100),Q(10,0,100);
AA1:=(REF(HIGH,N1) = HHV(HIGH,((2 * N1) + 1)));
AAA:=FILTER(AA1,N1);
BB1:=BACKSET(AAA,(N1 + 1));
CC1:=FILTER(BB1,N1);
CC:=(CC1 OR ISLASTBAR);
AA2:=(REF(LOW,N1) = LLV(LOW,((2 * N1)