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Can we add characters like α π Σ µ σ   Φ ¥ ε in the AES 256bit CBC Encryption Key?

Does it make the key more unique?

In my VB.NET application I am using a key like this: "∩TY&Hjubf78▐Φ4≥╬V% ÷⌡Uαπ^f7cHJßF"

Does it make any difference in Encrypting the data?

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