**We can confirm by asking the other employee that if i ask X then will he say that you speak truth?**

**If the other employee is a liar then he will not say No as the X will tell the truth and say No (that the other employee does not say truth) but the other employee says the opposite and will say Yes.**

**So, if the other employee is a liar he will say Yes.**

**Now if the other employee always says truth, he knows that X will tell lie and say that he does not speak truth.**

**So if the other employee always says truth he will say No.**

**Now the book is only available if the other employee is a liar and X speaks truth. So if the other employee says Yes to the question, it will be proved that he is a liar and the books are available while if he says No then he always says truth and X is a liar and the books are not available. **

**Hope that helps !!**