I believe that 10.6.2 tells me I cannot use the lower sign for dis here because it would be followed by the bold word terminator and not by a letter, a contraction, a modified letter or a ligatured letter.
You can use the contraction. See the Note to 10.6.2 at the top of page 118 of the UEB rules. The indicators (typeforms, etc) do not change the fact that the contraction is at the beginning of the word.
So I am still confused by the wording of 10.6.2. I did look at the top of page 118 and the way I read it is referencing the beginning of the word and type-forms and punctuation that may precede. As I wrote in my example disappointed is the word I am using. At the bottom of page 117 it talks about what can follow the lower sign and I do not see type-forms terminators listed as something allowed. I do find in 2.6.3 at the top of page 117 that it is OK for letter or letters- sequence to be followed by type-form terminators. Is this the rule I should reference for this lower sign situation? FYI Braille 2000 reads the contraction as a period.
Ah - I thought you were asking this question because of the opening typeform indicator...but your issue is really with the fact that there is a typeform terminator following the dis. And, you are right. You cannot use the dis contraction in that case. I'm sorry I didn't fully understand the question. If you look at 10.6.2, the very last thing, there is an example of disturb and the dis contraction is not used.
Thank you for clarifying this and continuing to ask questions.
I am new here and actually still doing the Lessons (I'm on lesson 17). I got confused when I saw the phrase "do not use them, meaning the be, con and dis contraction, if their letters are immediately followed by a typeform indicator...when they say indicator does that also include terminators because there is no mention of those.
In Lesson 15.1a it states:
Also, because the lower groupsigns for be, con, and dis must constitute the first syllable of a word and be followed by a letter, do not use them if their letters are immediately followed by a typeform indicator.