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Compose --- = — em dash
Compose --. = – en dash
By default - on a keyboard in a wordprocessor is hyphen. You'd have to go looking for a minus sign.
Maybe the Author didn't know how to do an em dash?
The danger of only proof reading on your own PC, or on one platform with embedded fault.
I must add that to our inhouse style guide with a warning where hyphen, en, em and minus are explained. I've done engineering inc mechanical drawings for years and never saw those characters, though when I started people used boards, pencils, paper, Mylar and drafting pens with stencils.
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