def read_all_subs(graph):
"""read all sub files into this graph so when add_one_subterm tries
to add, the sub will be available"""
subsDir = showconfig.subsDir()
for filename in os.listdir(subsDir):
# parsing nt is faster, but it should try n3 format if the parsing fails
graph.parse(os.path.join(subsDir, filename), format="n3")