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Besides using the dash for interruptions (broken sentence structure), there are some grammar rules that govern the use of the dash.
When a pronoun refers back to one noun, use a comma in front of the pronoun; when a pronoun refers back to several nouns, use a dash in front of the pronoun.
…We received several letters, each of which I answered.
…We received letters, cards, and emails — each of which I answered.
…I sent it to three friends, all of whom I expected to attend.
…I sent it to Ray, Anita, and Roxanne — all of whom I expected to attend.