text: Kate: Have you got the book?
  Steven: No, I didn't
  Victor: it's impossible to get it
  Mary: ok, so it's not only me
  Mary: I thought I'm just clumsy
  Kate: but how are we going to pass the exam without his stupid book
  Steven: do you think there will be only questions from the book?
  Kate: everybody says so
  Kate: his previous students
  Steven: why did I take this stupid course?
  Victor: maybe we should write him that we have problems
  Victor: maybe he could send a pdf?
  Kate: lol, I think he wants to earn money
  Kate: he wants sell books, not send pdfs
  Steven: :(
target: Kate, Victor, Mary and Steven can't buy the book for the exam anywhere. Since a professor wants to earn money on that book, he'll probably not send them a pdf version.