https://www.virtualbox.org/wiki/Download_Old_Builds_5_1
https://releases.hashicorp.com/vagrant/2.0.0/vagrant_2.0.0_x86_64.msi
https://releases.hashicorp.com/vagrant/2.0.0/vagrant_2.0.0_x86_64.dmg
vagrant box add ubuntu/xenial64 https://vagrantcloud.com/ubuntu/boxes/xenial64/versions/20170929.0.0/providers/virtualbox.box
@"%SystemRoot%\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -InputFormat None -ExecutionPolicy Bypass -Command "iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))" && SET "PATH=%PATH%;%ALLUSERSPROFILE%\chocolatey\bin"
https://progedu.github.io/intro-curriculum-faq/vagrant.html
http://nanno.dip.jp/softlib/man/rlogin/
https://code.visualstudio.com/download
https://github.com/progedu/assessment-for-donwload
https://progedu.github.io/assessment-for-donwload/assessment.html
https://github.com/hokaccha/nodebrew
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Map