Joe--

shipcmo's original post shows it: There are three unique lines per verse, however the first line is repeated. Actually, I can see the confusion because i the very first verse there, LINE 1 and LINE 2 are identical! However, the verses that follow each have 3 unique lines, that can be fit to this pattern:

LINE 1
choral response
LINE 1 (repeated)
choral response
LINE 2
LINE 3
choral response