map<string, double> WScore; //a score for each group combination i.e. AB, AC, BC.
int processors;
string outputDir;
+ map< vector<string>, set<int> > rootForGrouping; //maps a grouping combo to the root for that combo
EstOutput driver(Tree*, vector< vector<string> >, int, int);
EstOutput createProcesses(Tree*, vector< vector<string> >);