[amibroker] How To Code "...three or fewer bars ago"?

["longarm61" <norm1@xxxxxxxxxxx>]

Sorry for yet another newb question.  Does the following code mean 
"buy if cross occurs 3 bars ago ONLY" or does it mean "buy if cross 
occurs 3 OR FEWER bars ago?"  I would like it to state the latter.  
How is this done if not with the code below?:

Buy = 	Close > Ref( MA(  Close , 15 ) , -3 );









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