Can you figure out how I've split the below letters into their groups?
|Group 1||Group 2|
|D H L S||F P T Y|
|Group 1||Group 2||Group 3|
|C D H J N P V W Y||L T M||S B R|
|Group 1||Group 2||Group 3||Group 4||Group 5|
|B S||T R||C||D||L|
The letters are all pronounced similarly, but it's the difference that's key...