Wild Wisdom E-BOOK

Plot
After flattering this capable attacker, Bertha saw that he had no intention of continuing to tell him what to do, so he went down to the basement again, and after a while he brought up a machine that was half a person tall.
After pressing the start button, the machine made a creaking sound and began to move around regularly on the first floor, absorbing all the debris cut out from the ground.
Bertha, who was completely liberated from the cleaning work, opened the hole in the wall that supplied the laser energy, took out the used energy block, took a new one from his pocket and put it in.
The attacker looked at Bertha as if nothing had happened and began to clean the house. He became interested in various things in Bertha's house. However, when he touched the wall, he couldn't find Bertha's hand. Various mechanisms can be pressed out.
"You did it all?" The attacker studied for a while but failed to come up with the results, so he asked Bertha thoughtfully.
"A little means of self-protection." Bertha, who had restored all the mechanisms that had just been activated, replied, took out the garbage from the half-human-high machine, threw it to the door, and took out a stack of white cards from his pocket. The cards came out and I chose one to put on the bag of garbage.
Taking Bertha's actions into account, the attacker who clearly saw the pile of cards remained silent.
Bertha's previous action of inserting the card after entering the door was not included in the attacker's eyes. This was the first time the attacker saw Bertha's card, which was a wholesale version.
The attacker did not hide his curiosity and made a second request to Bertha unceremoniously: "Give me a card."
Bertha adapted very well to the identity of his prisoner. He took out all the cards in his pocket and presented them to the attacker, as if letting him choose.
Facing such an active prisoner, the attacker seemed a little overwhelmed. He paused for a moment and then randomly picked a card from the pile. Before he could ask anything, Bertha took the first step and actively said He explained to the attacker: "The card I put on the garbage bag just now is the reward. Someone will take away the garbage and process it later."
The attacker looked at the strange circuit pattern he had never seen before on this white card: "What is this?"
Bertha glanced at it and quickly replied: "The air conditioning card is inserted into the machine to adjust the indoor temperature. This card can be used for ten days." Bertha even looked a little proud when he said this.
The attacker who got this answer wanted to say something, but in the end he didn't say anything. He stuffed the cards he took out back into Bertha's card pile without much interest.
"I'm leaving Black Harbor in half a month." The attacker finally said to Bertha.
Bertha could tell that this was not the other party explaining his itinerary, but the other party's request to her.
There is no doubt that this was the other party's ultimate purpose of lurking into Bertha's house and capturing Bertha.
Faced with this request, Bertha said as if he was indifferent: "I made these cards, all the mechanisms in the house, and I extracted the poison just now."