In Figure 3, picture 1 showed the insertion of the board (paddle) into the water. 
Picture 2 showed that the two sticks (red and yellow) fell towards the moving 
paddle when it was moved from right to left. Picture 3 showed the two sticks (red 
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and yellow) falling completely onto the floor after the paddle was completely 
lifted up from the water. Picture 4 showed the remaining two sticks (green and 
purple) falling in the same direction as the red and yellow sticks within 2 seconds 
after the board was lifted up from the water.