N:=13;
M:=5;

A1:=REF(H,N)=HHV(H,2*N+1);B1:=FILTER(A1,N);C1:=BACKSET(B1,N+1);D1:=FILTER(C1,N);
A2:=REF(L,N)=LLV(L,2*N+1);B2:=FILTER(A2,N);C2:=BACKSET(B2,N+1);D2:=FILTER(C2,N);
E1:=(REF(LLV(L,2*N),1)+REF(HHV(H,2*N),1))/2;E2:=(H+L)/2;
H1:=(D1 AND NOT(D2 AND E1>=E2)) OR ISLASTBAR OR BARSCOUNT(C)=1;L1:=(D2 AND NOT(D1 AND E1 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 ISLASTBAR 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);
R1:=BACKSET(ISLASTBAR,BARSLAST(HD)+1);S1:=R1>REF(R1,1);T1:=BACKSET(ISLASTBAR,BARSLAST(LD)+1);U1:=T1>REF(T1,1);
R2:=BACKSET(S1,REF(BARSLAST(HD),1)+2);S2:=R2>REF(R2,1);T2:=BACKSET(U1,REF(BARSLAST(LD),1)+2);U2:=T2>REF(T2,1);

A`1:=REF(H,M)=HHV(H,2*M+1);B`1:=FILTER(A`1,M);C`1:=BACKSET(B`1,M+1);D`1:=FILTER(C`1,M);
A`2:=REF(L,M)=LLV(L,2*M+1);B`2:=FILTER(A`2,M);C`2:=BACKSET(B`2,M+1);D`2:=FILTER(C`2,M);
E