# Security code .....

Level pending

I bought a new Smart Phone this New Year. In this Smart Phone it has a $$4$$ digits security code number. Without Security Code no one can access this phone. I want to give it a strong security code so that every digit of the code is different (like 0123, 1234, 6789 etc.) But for easily remember this security code its sum of digits must be $$8$$ (like 0125, 1034 etc.) How many choices I have left?

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