Ante me non est formatus

Folio: 
025
Sequence: 
12
Office/Mass: 
V2
Genre: 
A
Position: 
M
Cantus ID: 
001436
Mode: 
1?
Differentia: 
a?
Manuscript Reading Full Text (standardized spelling): 
Ante me non est formatus deus et post me non erit quia mihi curvabitur omne genu et confitebitur omnis lingua
Manuscript Reading Full Text (MS spelling): 
Ante me non est formatus deus et post me non erit quia mihi curvabitur omne genu et confitebitur omnis lingua
Indexing notes: 
differentia looks to be a later hand and is erased (and what is erased before it?); is that even a differentia letter? // mode 1 is very common for this chant