Straight from source with added standard 1st mode beginning.

On top of the source, another unrelated source with the exact same melody : https://dlc.library.columbia.edu/catalog/cul:v6wwpzgpwg cf. https://cantus.uwaterloo.ca/chant/684715

Removed episema in coherence with CBMVN3A3b, 1007N1A1 and N2N3A2