def free(self):
        return set(self)
convert relative path to absolute path based (by default) on applications_parent
dataset/ETHPy150Open nltk/nltk/nltk/sem/drt.py/PossibleAntecedents.free--crossover with--dataset/ETHPy150Open uwdata/termite-visualizations/web2py/gluon/fileutils.py/abspath