We've been working out lots of "meets", or "least upper bounds", so it's good to emphasize that they don't always exist!

**Puzzle 26.** What is the simplest poset that contains two elements \\(x\\) and \\(y\\) that have no least upper bound?

**Puzzle 27.** What is the simplest poset that contains a subset that has no least upper bound?

**Puzzle 26.** What is the simplest poset that contains two elements \\(x\\) and \\(y\\) that have no least upper bound?

**Puzzle 27.** What is the simplest poset that contains a subset that has no least upper bound?