assert set((p.p_label, p.p_class, p.p_type, p.p_operator) for p in phrases) ==\
{('Zip Line', 'aerialway', 'zip_line', '-'),
('Zip Lines', 'aerialway', 'zip_line', '-'),
assert set((p.p_label, p.p_class, p.p_type, p.p_operator) for p in phrases) ==\
{('Zip Line', 'aerialway', 'zip_line', '-'),
('Zip Lines', 'aerialway', 'zip_line', '-'),