cs215/finalexam/06_distance_oracle_1_my.py: completed
cs215/finalexam/07_distance_oracle_2_my.py added (incomplete; got it working for a 3-node chain though)
cs215/finalexam/07_distance_oracle_2_my.py: more work, but not done
cs215/finalexam/07_distance_oracle_2_my.py: might have found a solution... need more tests