请老师把下面的通达信的主图（黄底，蓝顶）的那部分源码提取出来，并把黄底改为用B字表示买进，把蓝顶改为用S字表示卖出。在此先谢谢各位老师了，同时祝老师五一节快乐。VAR1:=CLOSE>REF(CLOSE,1) AND CLOSE>REF(CLOSE,2);VAR2:=REF(VAR1,1) AND CLOSE<=REF(CLOSE,1) AND CLOSE>=REF(CLOSE,2);VAR3:=REF(VAR2,1) AND CLOSE>=REF(CLOSE,1) AND CLOSE<=REF(CLOSE,2);VAR4:=REF(VAR3,1) AND CLOSE<=REF(CLOSE,1) AND CLOSE>=REF(CLOSE,2);VAR5:=REF(VAR4,1) AND CLOSE>=REF(CLOSE,1) AND CLOSE<=REF(CLOSE,2);VAR6:=REF(VAR5,1) AND CLOSE<=REF(CLOSE,1) AND CLOSE>=REF(CLOSE,2);VAR7:=REF(VAR6,1) AND CLOSE