(define-key global-map "\M-a" 'backward-sentence)
(define-key global-map "\M-e" 'forward-sentence)
(define-key global-map "\M-k" 'kill-sentence)
(define-key global-map "\M-a" 'backward-sentence)
(define-key global-map "\M-e" 'forward-sentence)
(define-key global-map "\M-k" 'kill-sentence)