Finish Letter Sequences with Two Patterns

Hello, letter detective, it's time for letter puzzle. Can you help us to solve the challenge below?

We are going to look at the alphabet in a different way to normal.

In this activity, you will be working out sequences that use letters of the alphabet. Some will be in alphabetical order, whilst others will be in reverse alphabetical order.

Below are two alphabet charts for you to use as a reference:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Z Y X W V U T S R Q P O N M L K J I H G F E D C B A 

Take a look at the following alphabetic sequence:
AC, DG, HL, _

What are the next two letters in the sequence? 

First, put your fingers on the letters A and C on the alphabet line above.
Then move them to D and G.
Then move them to H and L.

What do you notice?

The pattern is that the gap between each pair of letters widens by one each time like this: A_C, D_ _G, H_ _ _L etc.
If we apply this pattern then we get MR.
So the sequence would be: AC, DG, HL, MR, etc…

Did you get this?

In this activity, you will be a sequence superstar and work out which two letters come next.

Pssstt! Here's a handy hint to help you reach superstar status: Don't forget to use the letter line to help you work out the jumping pattern.

Good luck, letter sequencer!