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Dynamic typing allows a name i.e. identifier to refer to objects of different types at different points at run time-- Re-using a variable in this way is a really bad idea. Just use a different variable with it's own (static or dynamic) type.Dynamic scoping allows a name to refer to different objects at different points in run time-- This is a bad idea too. In general, let your variables mean what they mean when you first declare them. If you need to refer to something else, create a new variable specifically for that.