Revert "Hello J2."

This reverts commit adffd740638e93f060c47453644512cb6d25f8e2.
Revert "Hello G2"

This reverts commit 84bd9f3180025d1f37ec901ac504a64564b6a526.
Revert "add Hello J."

This reverts commit 3fac8346fc50d31ab31206630c84bd3cbf7982af.