I cannot understand why aab -> aan is defined as impossible to decode. Some replies about this are hidden. Can anyone help? Thanks!

thanks! checking types really helps

Thanks,i figured it out a minute ago though!

You can immediately print the input as the first line of your code.

How can i print the input in Javascript? console.log(comp([...],[....]))- do you mean this sensei?

Happy Coding

try printing the inputs and their types to see what you're dealing with, watch out for edge cases

Yes I got stuck because I tried to use stream. I am not sure how to make each value unique

Just scroll down???

Did anyone know stephane777's reply about the volcano and climbing test? I couldn't find it.