Cause
add_pairs function did not produce 3 pairs
Cause
add_pairs function did not produce 2 pairs
Cause
add_pairs function did not produce correct pairs
Cause
add_pairs function did not produce correct 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