Answer these questions: 
1. Easy: NAME_1 is taller than NAME_2, and NAME_2 is taller than NAME_3. Who is the shortest among the three?
2. Medium: There are five friends: NAME_4, NAME_5, NAME_6, NAME_7, and NAME_8. NAME_4 is taller than NAME_5, but shorter than NAME_6. NAME_7 is shorter than NAME_8. Who is the tallest among the five friends?
3. Hard: In a grid of 9 squares, three red squares are arranged vertically in the leftmost column, three blue squares are arranged horizontally in the bottom row, and three green squares are arranged diagonally from the top-left corner to the bottom-right corner. How many squares are left unoccupied in the grid? In your entire response, the letter c should appear less than 25.
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