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用全局變量，開倉前加上pos<1的判斷，收盤pos賦值為0，否則第二天也不開倉
VARIABLE:pos:=0;
IF HOLDING=0 AND TIME <145000 and TIME >090000 and pos<1 THEN BEGIN
IF COND1 AND POS<2 THEN
BUYSHORT(1,1,MARKET);
POS:=POS+1;
END
if time=CLOSETIME(0) then pos:=0;