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(setq m (point-marker)) ⇒ #<marker at 4714 in markers.texi>
(set-marker m 55) ⇒ #<marker at 55 in markers.texi>
(setq b (get-buffer "foo")) ⇒ #<buffer foo>
(set-marker m 0 b) ⇒ #<marker at 1 in foo>
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