It's;
... as described in paragraph b except when "a" is substituted for "some" but not "all" (except as defined in verse 4, line 7, word 6, letter 5 (a), then refer to Code 6 , line 2; "of which is" (as in line 8, but not paragraph 3 ..."
I know. I work with this stuff. What you do is, make the substitutions in the text, and it becomes readable again.