Alien Dictionary Order
Derive the alien dictionary order from a sorted list of alien words.
Input: words = ["z","x","z"]
Output: "" (Empty String)
Explanation: The letter 'z' cannot come before 'x' and then suddenly after 'x', creating a cycle and making the dictionary invalid.

Question

Derive the alien dictionary order from a sorted list of alien words.

Input: words = ["z","x","z"]

Output: "" (Empty String)

Explanation: The letter 'z' cannot come before 'x' and then suddenly after 'x', creating a cycle and making the dictionary invalid.