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     ⇒ #<marker in no buffer>
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(set-marker m1 100)
     ⇒ #<marker at 100 in markers.texi>
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(goto-char (point-min))
     ⇒ 1
(insert "Q")
     ⇒ nil
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m1
     ⇒ #<marker at 101 in markers.texi>
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(setq m2 (copy-marker m1))
     ⇒ #<marker at 101 in markers.texi>
(eq m1 m2)
     ⇒ nil
(equal m1 m2)
     ⇒ t
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(set-marker m1 nil)
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