In a small town, there exists a local bakery owned by an inventive woman named Esmeralda. Esmeralda is known for her unique bread recipes, which she keeps locked up in a safe in her office. She is very protective of her recipes and shares them with no one. Esmeralda's bakery staff includes two assistant bakers, Takashi and Amara, and a cashier named Dmitri. One day, Esmeralda decides to create a new recipe for a type of sourdough bread that she believes will become a bestseller. She spends several days perfecting the recipe, and once she is satisfied, she locks it in her safe. Esmeralda then informs her staff about the new sourdough without revealing any specific details, and she tells them that they will start selling it next Monday.

Over the weekend, Esmeralda falls ill and is unable to come to the bakery. She calls Takashi and instructs him to start making the new sourdough using the recipe she has locked in the safe. Esmeralda trusts Takashi and thus gives him the combination to the safe over the phone. Takashi successfully retrieves the recipe and begins making the sourdough bread. However, he does not inform Amara or Dmitri that he has the recipe or that he knows the safe combination. Esmeralda returns to the bakery on Wednesday and is delighted to find the sourdough bread selling well. She thanks Takashi and, assuming confidentiality, does not mention the safe combination to anyone else, nor does she change the combination.

A week later, the bakery plans an evening celebration for their loyal customers, and Esmeralda privately tells Amara to prepare a special version of the sourdough bread that includes olives. To do this, she discreetly gives Amara the safe combination, instructing her that the recipe modification is to be kept secret between the two of them. Amara access the safe, retrieves the recipe, and adds her twist to it without anyone else knowing. She keeps the safe combination to herself as instructed.

At the celebration, Dmitri notices that the sourdough sold that evening has a distinct olive flavor. He mentions this to Takashi, who acts surprised, as Takashi is unaware of the special version that Amara has made due to Esmeralda's instructions. Takashi wonders how Amara could have known to add olives since he believed himself to be the only one aware of the original recipe and the safe combination.

Given these circumstances and interactions, who is aware of the combination to the safe, who knows the olive twist to the sourdough recipe, and who is aware that others might know the safe combination or the recipe?
Esmeralda, the owner of the bakery, initially is the sole person who knows the combination to the safe where her recipes are kept and is also the only person who knows the recipes themselves. When she falls ill, she shares the safe combination with Takashi, trusting him with the access to her new sourdough recipe. At this point, Takashi knows both the combination and the recipe for the new sourdough bread. Esmeralda recovers and returns to the bakery but does not discuss the safe combination with anyone else and does not change it. Therefore, Takashi's knowledge of the safe combination and the sourdough recipe remains exclusive to him and Esmeralda.

Later, when Esmeralda wants Amara to prepare a special version of the sourdough, she shares the safe combination with her. Amara then knows the combination to the safe and the recipe with the special olive addition. Esmeralda has now entrusted the safe combination to both Takashi and Amara separately, yet neither is aware that the other also knows it.

During the celebration, Dmitri recognizes the olive flavor in the sourdough. He mentions this to Takashi, who is not aware of the special version prepared by Amara. Takashi is left in the dark regarding the olive addition to the sourdough. The only people aware of the olive twist to the sourdough recipe are Esmeralda, who instructed it, and Amara, who executed the instruction.

To summarize the state of knowledge:
- Esmeralda knows the combination to the safe and the original sourdough recipe. She also is aware of the olive twist, having instructed Amara to make it.
- Takashi knows the combination to the safe and the original sourdough recipe but not the olive twist.
- Amara knows the combination to the safe and the olive twist recipe but is unaware that Takashi also knows the safe combination.
- Dmitri is aware that there is an olive twist to the sourdough but does not know the combination to the safe, the original recipe, or who exactly would know either.

None of the staff members, apart from Esmeralda, knows for certain who else is privy to the safe combination or the modifications to the recipes. Both Takashi and Amara presumably think they have exclusive knowledge when it comes to the safe combination and the original sourdough recipe. Amara alone knows about the olive addition. Esmeralda remains the only person with full knowledge of who has access to the safe combination and the recipe details.