results produced by ilp_solver

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Hi,

I used ilp Solver on around 20 taxa dataset. The output from ilp Solver is a Digragh. When i try to export it into a newick fomat. Sometimes it will succeed and sometimes not. I wonder why would this happen? Another question is , when i have the output as a newick, some subtree/groups of taxa will appear more than once. the itol view will display them randomly. However, how should choose the best tree.

Thank you for your answer.