N:=5; LT:=LLVBARS(L,N); A1:=BACKSET(BARSTATUS=2,LT+1); A2:=BACKSET(BARSTATUS=2,N+LT+1); HH:=IF(A2 AND NOT(A1),H,0); HT:=HHVBARS(HH,0); A3:=BARSLAST(CROSS(BACKSET(BARSTATUS=2,HT+1),0.5)); A:REF(H,A3);