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I graduated from University of California.
I graduated from the University of California.

1. Which of the above is correct? and natural? If both, any difference in meaning?

2. Suppose the said university can be abbreviated to UC, which of the following is correct? and natural? Again, if both, any difference in meaning?

I graduated from UC.
I graduatd from the UC.
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The correct phrases are:-

I graduated from the University of California
I graduated from UC.
Comments  
Thank so much, Louise. I now understand the correct usage.