You can run by using Ctrl + Enter in Custom Test of AtCoder
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Fix bug. Work!
Fix bug. There is two button whose selector is a.btn.btn-primary on custom_test in practice contest.
Change the script name.
Fix bug
Fix bug to make it work
Make it work in English environment e.t.c.
Add explanation to the button
Add local Japanese infomation
refactor the code
Use let and event.key to remove old var and event.keyCode
let
event.key
var
event.keyCode
Refactoring
