This arrangement is for S1/S2/A1/A2, flute and violin. S1 and A1 are the higher soprano and alto voices. S2 and A2 are the lower soprano and alto voices. Flute and violin parts are somewhat interchangeable and could be exchanged on repeats for variety and to keep the poor violin player from falling asleep. I might recommend skipping verse 2 and only doing it twice through instead of 3 times.