An elephant is usually gray, has four hooves, two
tusks, and two ears, it can be from India or form
Africa.
-----------
Frame : elephant
color : (default : gray)
number-of-hooves : (default : four)
number-of-tusks : (default : two)
number-of-ears : (default : two)
........
........
In absence of other information we can
reasonably make the assumption that a default
value holds.
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