| 1234567 | <div>    This field is optional. Specify the user name used to access the instance using    ssh. For many Amazon AMI's this is 'ec2-user'; Ubuntu images use 'ubuntu'. If you    don't specify this, 'root' is assumed.    If the user does not have direct administrative    access, i.e. is not 'root', you should also set the root command prefix, i.e. to 'sudo'. </div>
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