Most sentences begin and end with no punctuation other than the period at the end. Sometimes, a comma is used. There are occasions, such as when more than one thought is expressed, that a pair of commas are needed. That is often all the punctuation used by an attorney writing an appellate brief. But what of the dash — punctuation that can add flare and style to your brief if used correctly.  The dash can be used to emphasize a portion of a sentence by highlighting it through setting it apart. In his classic book on writing nonfiction, “On Writing Well,” William Zinzer sings the praises of the often forgotten and neglected dash mark. Somehow this invaluable tool is widely regarded as not quite…