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(vc-backend-logentry-check, vc-revert-buffer): Likewise.
(vc-retrieve-snapshot, vc-create-snapshot): Likewise.
(vc-diff, vc-finish-logentry, vc-steal-lock): Likewise.
(vc-register, vc-next-action-on-file, vc-registration-error): Likewise.
(vc-cancel-version): Add space to end of question.