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Last month, PKR’s Selangor menteri besar Datuk Seri Amiruddin Shari was previously quoted saying that the chief ministers and menteris besar of the six states that must hold elections this year have tentatively agreed to call these simultaneously in June.
The six states are: Selangor, Penang, Negeri Sembilan, Kedah, Kelantan and Terengganu.
Is the colon after "are" optional?

Thanks.

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tamguatlayIs the colon after "are" optional?

The colon is wrong. "The six states are Selangor, Penang, Negeri Sembilan, Kedah, Kelantan and Terengganu."

You might use a colon if you make it "The six states are the following: Selangor, Penang, Negeri Sembilan, Kedah, Kelantan and Terengganu." But that is unnecessary and sounds like it.