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(with-eval-after-load 'cider-grimoire
  (defun my/cider-grimoire-set-markdown-mode (&optional arg)
    (when (fboundp 'markdown-mode)
      (with-current-buffer (get-buffer cider-grimoire-buffer)
        (markdown-mode))))
  (advice-add 'cider-grimoire :after 'my/cider-grimoire-set-markdown-mode))