>Perhaps I'm misunderstanding the pre/post parameters?

Pre/post parameters: " 'six' or 'seven' should not appear $pre tokens before 
'thirty' or $post tokens after 'thirty'

Maybe something like this:
spanNear([
  spanNear([field:one, field:thousand, field:one, field:hundred], 0, true),
  spanNot(field:thirty, spanOr([field:six, field:seven]), 0,
1)
  ], 0, true)

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