Multiple-Column Unique Index Redundancy

[John Kornet]

I've been over a few books, the site, and the archives... Can someone 
please confirm that if I create a unique index over 2 columns, it will 
be redundant to create a regular index for the first?

In other words, does the left-prefix rule apply to unique indexes that 
specify uniqueness over multiple columns?

Thanks in advance for taking a few minutes for me!
John Kornet
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