[a,b,c]is not a valid doubly linked list.
[a,b,c]is not a valid doubly linked list.\nIf you are getting the following error it is probably because you have not set the child of "flattened" node to NULL
`[a,b,c]is not a valid doubly linked list.`\nIf you are getting the following error it is probably because you have not set the child of "flattened" node to `NULL`
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