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DIFF:=EMA(C,12) -EMA(C,26);
DEA:=EMA(DIFF,9);
豆豆:=BARSLAST(REF(CROSS(DIFF,DEA),1));
豆豆1981:=REF(C,豆豆+1)>C ANDREF(DIFF,豆豆+1)<DIFF AND CROSS(DIFF,DEA);
底背離:豆豆1981>0;