Pentecostarion
The Pentecostarion ( Greek: Πεντηκοστάριον , "Pentekostárion"; Slavonic: Цвѣтнаѧ Трїωдь , "Tsvyetnaya Triod' " , literally "Flowery Triodon"; ) is the liturgical book used by the Eastern Orthodox and Byzantine Catholic churches during the Paschal Season which extends from Pascha ( Easter ) to the Sunday following All Saints Sunday ( i . e . , the Second Sunday After Pentecost ) . 
<triplet> Pentecostarion <subj> liturgical book <obj> instance of