Ask the teacher to replace the following straight flush index with the stock selection formula, which requires attention and signal selection.

Trend: = (EMA ((closing -LLV (low, 36))/(HHV (high, 30)-LLV (low, 36)) * (4), 4) * (25);

Bottom: =MA (closing, 20)-2*STD (closing, 20);

B6:= L & lt； Lower part and C> lower part and C & gtREF(C,1);

Bottom-hunting: =IF(FILTER(CROSS (trend, 5.5),10) and c > REF(C，2)， 15，0)；

Minus 1:=IF(FILTER(CROSS, 86), 5), 72, 87.5);

Minus 2:=IF(FILTER(CROSS (trend, 92), 10), 67,87.10);

Minus 3:=IF (filter (cross (95, trend), 5), 62, 87.5), color;

b 1:= COUNT(COUNT(C & lt； REF(C, 1), 3) = 3,2) =1and C> is open and C & gtREF(C,1);

B2:=COUNT(B 1，20)>=2 ;

FILTER(CROSS(C, MA(C, 20)) and MA(C, 20)>MA(C, 10) and C & gt=MA(C, 60), 10) or

FILTER(CROSS(C, MA(C, 20)) and MA(C, 20)>MA(C, 10), 5));