Explanation:

- H buys a book followed by at least six people. Therefore, H is at the third position.

- There are two people between H and C, positioning C at the sixth.

- M buys immediately after F and before E, implying a sequence of (F, M, E).

- Not more than two people between C and E, E can be at the seventh position.

- A buys a book before G and after H. So, A is somewhere between the fourth and fifth.

- Less than three people between G and B, implying G is at the eighth and B is at the fifth.

- B buys before G and not first, so B fits in the fifth position.

- A is hence at the fourth, fitting all conditions.

- K takes the first spot.

With the sequence deduced as K, F, H, A, B, C, E, G, M:

- Second last position is G.

.