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CTA1:=(CLOSE-LLV(LOW, 18))/(HHV(HIGH, 18)-LLV(LOW, 18))*100;CTA2:=SMA(CTA1, 9, 1);CTA3:=SMA(CTA2, 3, 1);CTA20:=3*CTA2-2*CTA3,COLORWHITE,LINETHICK3;CTA21:=EMA(CTA2, 3),COLORRED,LINETHICK3;★逢低买入: REF(crOSS(CTA21,CTA20),82) AND CTA211.3*CTA20,STICK,LINE