Shouldn't that be the case. How can more than one wire be connected to a single letter.
If a wire is connected to say letter 'A', the other end of the wire can connect to any of the other 25 letters viz., 'B' through to 'Z'.

I corrected the typo-
elif len(wires) > 20:

Thanks!

I have two features which I think if added will greatly increase the ease of coding:

1.) While solving problems, on clicking 'SUBMIT', the data set against which the code is tested should be made visible as this will help in debugging the code in case of problems.

2.) An option to keep working on a current problem later on where it gives the option to save your code and continue on demand.

When will Python 3.4 or above be made available to use for solving the featured problems instead of Python 2.7.x?

While 'submitting' my code, I am getting the following two errors:

Wires are only mapped once
✘ Should not have accepted a second definition for a wire end
✘ Should not have accepted a second definition for a wire end

Since, I don't have the test data to understand the reason for this error message, I am lost.
Any help?

Thanks!

sum_pairs([10, 5, 2, 3, 7, 5], 10) should return [5, 5] and NOT [5, 5] according to the given instructions of left REDUX.
Can this ambiguity be taken care of please?

Thanks for the answer!