As usual, our wonderful leader here in Jacksonville, FL, Lynnette Taylor, found the answer for me.
The Lesson Manual is incorrect with Drill 37, Sentence 5 and Sentence 23 of the Lesson 15 exercise.
Drill 37, Sentence 5. "... say goodbye to S.. D.... ..." The Drill answer key shows a grade 1 indicator before the S and the D. This is incorrect, according to the UEB Rules.
Lynnette directed me to UEB Rules, Section 10.12.13, page 160, Omitted Letters. The section shows several examples of periods used as omission without the grade 1 indicator.
My thinking was correct, OH Happy Day.
Thank you anyway. You've helped me previously several times.