double ig_ub_DB_CARDINALITY = myDBRef.IGub(P, ai);
if(maxIG > ig_ub_DB_CARDINALITY){
//skip mining on Db
}
else{
ConditionalDB cond_db_for_B = myDBRef.getConditionalDBForPattern(B);
FPTree Pb = cond_db_for_B.buildConditionalFPTree();
if(Pb.getCount() == P.getCount()){
System.out.println("skipping an entire branch since support is the same");
}else{
branch_and_bound(Pb,s,B);
}