>>> from graf_exp import *

>>> le = [('a*(b+c)', 'a'), ('a*(b+c)', 'b+c'),
... ('c/b', 'c'), ('c/b', 'b'),
... ('b+c', 'b'), ('b+c', 'c')]
>>> g = crea_digraf_exps(le)
>>> lec = exps_completes(g)
>>> print (sorted(lec))
['a*(b+c)', 'c/b']