You might try to see if it's come kind of contextual speedwriting. I learned a version of speedwriting in college in which the letter "e" and the letter "i" are

You might try to see if it's come kind of contextual speedwriting. I learned a version of speedwriting in college in which the letter "e" and the letter "i" are exactly the same and deduced later by context; likewise, the letter "h" and the letters "la" appear to be the same. In other words, it might be more of a crude symbolic code. Just a thought.