Reaches:

The index fingers cover a lot of keys. Besides the index finger reaches we have learned so far, there are SIX more!

right-index-up-and-to-left -> y
right-index-to-left -> h
right-index-down-and-to-left -> n
left-index-up-and-to-right -> t
left-index-to-right -> g
left-index-down-and-to-right -> b

This gives us the entire alphabet!