Index Match with an or function

Hey all,

I have a table with two columns. One column is names, the second column is their class (1, 2, 3, or 4). I am looking to create a formula that shows all of the names from class 1, 2, or 3, but eliminates all of the blanks for the rest of the cells.

I have attached a sample file as an example.

Regards,
B