B1:=FILTER(A1,N);
C1:=BacKSET(B1,N+1);
D1:=FILTER(C1,N);
A2:=REF(L,n)=LLV(L,2N+1);
B2:=FILTER(A2,N);
C2:=BACKSET(B2,N+1);
D2:=FILTER(C2,N);
E1:=(REF(LLV(L,2N),1)+REF(HHV(H,2*N),1))/2;
E2:=(H+L)/2;
H1:=(D1 AND NOT(D2 AND E1 =E2)) OR BARSCOUNT(C)=1;
L1:=(D2 AND NOT(D1 AND E1 E2));
H2:=D1 AND NOT(D2 AND E1 =E2);
X1:=REF(BArslAST(H1),1)+1;
F1:=BACKSET(H1 AND COUNT(L1,X1) 0,LLVBARS(IF(L1,L,10000),X1));
G1:=F1 REF(F1,1); I1:=BACKSET(G1,2);
LD:=I1 REF(I1,1);
L2:=LD OR BARSCOUNT(C)=1;
X2:=REF(BARSLAST(L2),1)+1;
F2:=BACKSET(L2 AND COUNT(H2,X2) 0,HHVBARS(IF(H2,H,0),X2));
G2:=F2 REF(F2,1);
I2:=BACKSET(G2,2);
HD:=I2 REF(I2,1);
TSHD:=IF(BARSLAST(LD) =BARSLAST(HD),BARSLAST(HD),0);
crOSS(C,REF(H,REF(TSHD,1))) AND C O or C REF(H,REF(TSHD,1)) AND C