Hello children, it's time for an important lesson with Professor Flans.
This is about four letters that people sometimes confuse for one, L-M-N-O!

L-M-N-O
Are four letters
L-M-N-O
Are not one

L
L M
L M N M N oh!
L-M-N-O
L M N oh!
L-M-N-O

L-M-N-O
Are four letters
L-M-N-O
Are not one

L-M-N-O

L M N oh!
L-M-N-O
L M N oh!
L-M-N-O