Credimus expresse cures nobis ut

Source: 
Sankt Gallen, Stiftsbibliothek, 391
Marginalia: 
T
Folio: 
104
Sequence: 
3
Feast: 
Assumptio Mariae
Office/Mass: 
X
Genre: 
A
Position: 
2
Cantus ID: 
206502
Mode: 
?
Differentia: 
*
Manuscript Reading Full Text (standardized spelling): 
Credimus expresse cures nobis ut ad esse
Manuscript Reading Full Text (MS spelling): 
Credimus expresse cures nobis ut ad esse
Indexing notes: 
What is this chant? On top margin is another chant in the same hand as that on pp. 71, 76 and 83;