Deductions & credits

Ok so on the first 2555 (2014) I would say (6b) I didn't file the form before and the second 2555 (2015) I would say (6a) that I filed 2555 year 2014 and on the third 2555 (2016) I would say (6a) that I filed 2555 "2014 and 2015" or do I say only 2015? This inspite the fact as none of them are processed yet as I will send them in at the same day and it's possible that they arrive in a random order.