[phenixbb] AutoBuild Question

Dear phenix community: I ran AutoBuild.dat with a seq.dat file that has 3 separate sequences. Chains A and B were built, but chain C was not, even though there is density for the third chain. It occurred to me that only two of the three chains may have been read in. I seem to recall that seq.dat can be a maximum of two sequences, but am not sure. So, is there a limit to the number of sequences that can be present in seq.dat and if so, what is the limit. Thanks in advance, Rebecca