Chemistry Joke: Deciphering the Molecule H I J K L M N O

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I have a little chemistry joke:

what is this molecule:

H I J K L M N O
 
Chemistry news on Phys.org
Does no one know??
 
the answer is H20
 
I don't get it.
 
H to O

H------->O


Its just a listing of the letters from H to O
 

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