from_stop_id,to_stop_id,transfer_type,min_transfer_time
20703_01,20703_01,1,
20703_01,20703_02,1,
20703_02,20703_01,1,
20703_02,20703_02,1,
20704_01,20704_01,1,
20704_01,20704_02,1,
20704_02,20704_01,1,
20704_02,20704_02,1,
