Fun4U: Three Blackbirds

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There are three Blackbirds on the roof of a house. A hunter shoots one
    of them with his rifle. How many of the blackbirds are left on the roof?
 
 Answer Number 1) None, if the dead bird falls off and the rest fly away.
 Answer Number 2) Three. If the roof is so flat that the dead bird does not
    fall off the roof, and the other birds are not scared off by the shot.
 Answer Number 3) One, the roof is flat and the bird does not fall off,
    but the other birds fly away.
 Answer Number 4) Two, if the dead bird falls off but the others stay. or
    if the dead bird does not fall off, and one of the others flies away.
 
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