answer: #Person2# wants to buy a gift for a Japanese family. #Person1# suggests pen sets and tells #Person2# not to give four of anything. #Person2# decides to take the single pen and pencil set.
documents: #Person1#: Can I help you?
  #Person2#: Yes, I'm looking for a gift for a Japanese family here that I'm going to stay with. What do you recommend?
  #Person1#: Pen sets are always a good gift.
  #Person2#: Isn't that too small? You know... I'm here to learn Japanese in a college for a whole year. I think it's a long time and it'll be a great trouble to the family, so I'll...
  #Person1#: Well, I see... But we Japanese consider it important to respect each other, rather than give expensive gifts.
  #Person2#: Yes, all right, let's see pen sets. There's sets with a pen and a pencil, and bigger sets with four pens.
  #Person1#: Don't give a set of four pens to your Japanese friend. In fact, don't give four of anything.
  #Person2#: Why is that?
  #Person1#: The Japanese word 'four' sounds like the word for 'death'. It means bad luck.
  #Person2#: Thanks a lot. In that case, I'll take the single pen and pencil set.
  #Person1#: Good choice. These sets make very good gifts. After all, pens write in any language.
  #Person2#: Right.