Use em dash instead of --

Reference: /n/sources/patch/applied/gettysburg-emdash
Date: Thu Sep 21 23:26:11 CES 2006

--- /lib/gettysburg	Wed Sep 20 00:17:23 2006
+++ /lib/gettysburg	Wed Sep 20 00:17:21 2006
@@ -9,8 +9,8 @@
 resting place for those who here gave their lives that that
 nation might live.  It is altogether fitting and proper that
 we should do this.
-  But, in a larger sense, we can not dedicate -- we can not
-consecrate -- we can not hallow -- this ground.
+  But, in a larger sense, we can not dedicate — we can not
+consecrate — we can not hallow — this ground.
   The brave men, living and dead, who struggled here, have
 consecrated it, far above our poor power to add or detract.
 The world will little note, nor long remember what we say here,
@@ -18,12 +18,12 @@
   It is for us the living, rather, to be dedicated here to the
 unfinished work which they who fought here have thus far so
 nobly advanced.  It is rather for us to be here dedicated to
-the great task remaining before us -- that from these honored
+the great task remaining before us — that from these honored
 dead we take increased devotion to that cause for which they
-gave the last full measure of devotion --
+gave the last full measure of devotion —
   that we here highly resolve that these dead shall not have
-died in vain -- that this nation, under God, shall have a new
-birth of freedom -- and that government of the people, by the
+died in vain — that this nation, under God, shall have a new
+birth of freedom — and that government of the people, by the
 people, for the people, shall not perish from this earth.
 
 Abraham Lincoln, November 19, 1863, Gettysburg, Pennsylvania