Absence of the Symbol Resembling '4' in the Very First Folio 1r

[oshfdk]

Here is an example of the numeral 4 shown as l in the You are not allowed to view links. Register or Login to view. from the late 13th century and 
a subsequent later addition on the left-hand side with said numeral 4 shown as q.

So, on the left-hand side it's both 4-like 4s and 4-like 5s? Interesting, I think I've never seen them used together.