Question 4 of 11
How to play the game
         Show Diagrams
 O2  +   H2     H2O  
O-O H-H H-O-H  
O-O H-H H-O-H  
O-O H-H H-O-H  
O-O H-H H-O-H  
O-O H-H H-O-H  
O-O H-H H-O-H  
O-O H-H H-O-H  
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