The input file should be a binary matrix (each element is either a 0 or a 1). Each row corresponds to a SNP and each column corresponds to a strain. There should be no empty rows before the last row, and no empty columns before the rightmost column.

The input file should be a binary matrix (each element is either a 0 or a 1). Each row corresponds to a SNP and each column corresponds to a strain. There should be no empty rows before the last row, and no empty columns before the rightmost column.