elisp - How to customize Emacs keyboard shortcut for deleting current line -

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I would like to delete the current row when alt , and the letter d is pressed twice.

How can I get it inside my Emacs configuration file?

Currently I have it in my .emacs : (global-set-key (kbd "M-0") 'other-window) 

  (universal-set-key (kbd "M-9") 'back-window' code>   
 
 
 You can use your own keymap:  
  (defvar (definition-key somdename-map (kbd "Md") 'kill-line' (define-key somename -map (kbd "Mw") 'kill-line' (definition-key somename-map) (global-set-key (kbd "Md") somename-map)

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