Also, the puzzles are missed numbered after puzzle 185.

>*Puzzle 186*. Are the graphs we used above to describe the preorders A and B Hasse diagrams? Why or why not?

No. A Hasse diagram must be acyclic, and the graph for A has a cycle.

>*Puzzle 186*. Are the graphs we used above to describe the preorders A and B Hasse diagrams? Why or why not?

No. A Hasse diagram must be acyclic, and the graph for A has a cycle.