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Yea, me too
This comment is hidden because it contains spoiler information about the solution
I learned something new with this kata. Thank you
I may be wrong but for the provided larger test case, partial wire definition (ie: ABC) should raise exception, not returning unpaired letter? Below is the given test case which asks "Should not have accepted a partial wire definition"
Not enough wire ends defined
ABCDEFGHIJKLMNOPQ
So in short, Plugboard should only accept pairs. Only when I process a letter not included in plug board, then I should return the same letter?