From something I recently read for a client:
"We have several core competencies—they are"
I often see em dashes used incorrectly, especially instead of a period. The main use of an em dash is to initiate a break in thought:
"He asked me out—I couldn't believe it—and I gladly accepted."
So, above it would be better to use different punctuation:
"We have several core competencies:"
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