Naima walked into her friend Akio's living room and placed her novel on the coffee table before going to the kitchen to help Leila with snacks. While they were in the kitchen, Akio's cousin Sumiko arrived and sat in the living room. Sumiko saw a suspenseful movie poster that reminded her of a recent novel she read. She noticed Naima's book and, believing it was Akio's, she borrowed it, leaving a note for Akio. Sumiko then left. Taavi came in next and admired the movie poster, then sat down to wait for everyone else. While waiting, he saw the note from Sumiko and read it, but he didn't touch the book. Akio returned to the living room after Sumiko left and noticed the novel was gone with a note in its place. Later, when Naima asked everyone if they'd seen her novel, how did Akio and Taavi each respond based on their knowledge of the situation? Provide a short response.
Akio responded to Naima's question by explaining that her novel was borrowed by Sumiko; this is because Akio saw the note left by Sumiko in place of the book, which allowed Akio to infer that Sumiko had taken it. Although Akio didn't witness Sumiko taking the book, the presence of the note provided the necessary information to make this deduction.

Taavi responded by confirming he saw the note indicating that Sumiko took the book. Since Taavi read the note from Sumiko, he was aware that Sumiko had borrowed the book. He did not see Sumiko take the book, nor did he observe Naima leave it there, but the note's content was enough for him to understand the book's current whereabouts as being with Sumiko.

Each individual's response was based on their direct knowledge of the situation: Akio from finding the note after the book's disappearance, and Taavi from reading the note left behind by Sumiko. Neither of them saw the actual moment when Naima placed the book on the table or when Sumiko picked it up, but they pieced together what happened from the note and its implications.