Here is an introductory paragraph with 100 words providing background on nine oak investments and mentioning key_word and higher_word.

A sub-title summarizing key information related to higher_word
Detailed sub-content expanding on the sub-title with at least 500 words that makes use of provided context articles where applicable.
Another sub-title for key conclusions related to higher_word
Expanded sub-content for this section in 500+ words using context if available.
A concluding paragraph with 100+ words summarizing core content and reinforcing key_word and higher_word.