running sample causes errors but submitting passes all test cases?

why do I get an unknow error?

why does the ordering of the duplicates matter?

yup. this kata was pretty challenging. one of the test cases was "this kata easy" and far from easy

kata is easy author said.good luck with random edge cases

what happened to the test cases?
there is none

is this a bug?
'codewars', 'code', 'wasr' it gives me an error saying

codewars is not a merge of code and wasr which it is :/

im sorry man. can you dumb down the instructions?

it's all too technical and vague

in fact all the linked lists instructions are. :/

my solution varies?

I've solved this but when I first submit my solution it fails but the second time it passes?

did you resolve your problem? Im kinda having the same one too

What is this?

passed all 9 test cases but the last one gives an error?

Traceback:
in
in solution
File "/usr/lib/python2.7/re.py", line 151, in sub
return _compile(pattern, flags).sub(repl, string, count)
File "/usr/lib/python2.7/re.py", line 244, in _compile
raise error, v # invalid expression
sre_constants.error: unexpected end of regular expression

I never knew you could do an operation within a dictionary

I don't get this regex can you explain whats going on?