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We've got "maria", and then something with a y--probably "hymnus". So likely a minor responsory for Vespers or Lauds of a Marian feast, followed by the hymn--but we can only read the bottoms of the letters! fragmentarium.ms/view/page/F-f3…
one word looks like maybe it's "chorus". "chorus" is a pretty popular word in hymns it turns out. 
and let's say "maria" isn't much of a clue...
but can we find something where "maria" and "chorus" could be close together? how about this nice hymn for Purification?
it's juuuust possible you would sing this lovely responsory beforehand, if you were in Belgium anyway. and it was vespers. (you'd have sung it that day before, so "Gaude maria. hymnus: Quod chorus" is all the MS gives.)
so what does that make the fancy blue letter? looks like the chant starts with C 🍪🍪🍪...
one strong contender is the antiphon "cum inducerent" (often for Lauds, sometimes Vespers).
i could believe that that last word is "puerum". So: probably the Magnificat antiphon at second Vespers of Purification!
no idea what this is on the other side though, sorry
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