B to A: Hmm! I just want to know if you have any books related to mathematics.

A to B: Of course we have many!

What kind of math book do you want?

Geometry? Statistics or something?

C to B: Wow ~ ~ Are you B?

B to C: Yes! Hi! c！ What a coincidence that we can meet here! What's the matter?

C to B: Well, "just like you", I'm looking for a math reference book, because the final exam is there.

B Right A: Well, I want to buy a book about statistics.

C to a; Well, I like geometry.

A to B&; C: OK! We put the statistics books on the second floor of this building. You can get some there. And the geometric city on the third floor!

B right A: Really? I really appreciate it．

C to a: thank you!

B to C: Let's get the books together, huh?

C to b; Why not! Here we go.

(sigh. . . But it is estimated that no one does not have the word 150. . . )