multiple values single key vim script

HI ,

 I have the file which has key value pair, for single key there are four entries i want  align all the values hoirzontall

file contains

alert_pref_email Nh?n các c?nh báo thông qua th? ?i?n t?

alert_pref_email Receive the Alerts through Email

alert_pref_email Terima informasi penting melalui Email

alert_pref_email ??????????????????????????

alert_pref_email Nh?n các c?nh báo thông qua th? ?i?n t?

output i would like to have like this

alert_pref_email Nh?n các c?nh báo thông qua th? ?i?n t?  Receive the Alerts through Email Terima informasi penting Nh?n các c?nh báo thông qua th? ?i?n t?

can anybody help

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Thanks & Regards
 Vickyb

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