Cause
vote function did not correctly set ranks
Cause
record_preferences function did not correctly set preferences
Cause
sort_pairs did not correctly sort pairs
Cause
lock_pairs did not lock all pairs
Cause
lock_pairs did not correctly lock all non-cyclical pairs
Cause
lock_pairs did not correctly lock all non-cyclical pairs
Cause
print_winner did not print winner of election
Cause
print_winner did not print winner of election