[ Info: Reading s1.json...
[ Info: Building graph...
[ Info:                2 time periods
[ Info:                6 process nodes
[ Info:                8 shipping nodes (plant)
[ Info:               10 shipping nodes (collection)
[ Info:               38 arcs
[ Info: Building optimization model...
[ Info: Optimizing MILP...
[ Info: Re-optimizing with integer variables fixed...
[ Info: Extracting solution...