帮我编一个选股公式（用在通达信上的）。DIF和DEA连续20日大于0，且今日DIF上穿DEA。（用在通达信上的）
应该是DIFF吧
DIFF :EMA(CLOSE,12) - EMA(CLOSE,26);
DEA := EMA(DIFF,9);
XG:COUNT(DIFF>0,20)=20 AND COUNT(DEA>0,20)=20 AND CROSS(DIFF,DEA);
DIFF :EMA(CLOSE,12) - EMA(CLOSE,26);
DEA := EMA(DIFF,9);
XG:COUNT(DIFF>0,20)=20 AND COUNT(DEA>0,20)=20 AND CROSS(DIFF,DEA);
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