It's the holiday season and you are looking at parties in the area. You are deciding between the 3 closest to you. All the parties seem to have a strict dress code and let people in based on certain criteria.

At the first party, you notice that a woman wearing a blue dress and blue socks is let into the party. However, a second woman wearing a blue dress and pink socks is denied entry. A third woman wearing a green dress and blue socks is also denied entry. What is this the best representation of?

At the second party, you notice that a woman wearing a bow in her hair is denied entry. However, a different woman not wearing a bow is allowed in. What is this the best representation of?

At the third party, you notice that a man and his daughter and his son are allowed into the party. A different man with just his son is also allowed in. A third man with just his daughter is also allowed in. However, when a fourth man came alone, he was denied entry. What is this the best representation of?