For USA brokers, what settings should I use to make Icarus EA FIFO compliant? Thanks

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In B3.9.6.EUh1_v1.set.txt: EANumber=1 EANumber,F=0 EANumber,1=1 EANumber,2=0 EANumber,3=0 I understand "EANumber=1", but what does the letter/digit after "EANumber," (i.e. F, 1, 2, 3) mean?

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