[amibroker] duplicate names in exploration

["murthysuresh" <money@xxxxxxxxxxxxxx>]

when i explore over multible bars, i get results of the same ticker 
multiple times because the filter  signal would have been true for 
those related bars. how do i filter out the duplicates so that i get 
only the results outputted once even though i am exploring multiple 
bars. 

i thought there was a formula posted earlier by TJ for this earlier and 
could not find it. the following is my exploration i am doing over 15 
minute bars for today's date and i get duplicate ticker for different 
timestamps for today.

higherVol=V>(EMA(V,15) *1.5);
Buy_true= IIf(DateNum()==LastValue(DateNum())  AND 
HigherVol,True,False);
//
Filter=Buy=Buy_true>=1;
AddTextColumn(WriteVal(LastValue(Cum(Buy_true))),"No of Times its true 
today");


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