What is the shortest complete sentence in English?

There are two main candidates for the shortest sentence in the English language: 

1. 'Go!' 
2. 'I am'.

Why 'Go!'?

My vote is for 'Go!' because it has:

• an active verb
• an implied subject 
• a clear meaning. 

I am only has meaning when used as an answer to a question: Who is going to the Moon this morning? I am. In any case, two words beats three!

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