Final answer:
The question lacks context and details regarding the meaning of 'OAB' and the field related to the concept of 'Mark unfolding'. Clarification is required in order to provide an accurate answer.
Step-by-step explanation:
I'm sorry, but it appears there is a lack of context to fully understand your question regarding 'OAB' and how 'Mark unfolds'. The term 'OAB' could potentially refer to multiple subjects, such as the Order of Attorneys of Brazil in law or Overactive Bladder in health or medicine. Furthermore, the process of 'unfolding' might indicate a concept from mathematics, literature, or another field depending on the context. Providing additional details or clarification about what 'OAB' stands for and what the subject is would help in delivering an accurate and helpful response.