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Does a subtraction symbolic expression actually exist?

Can someone please give me an example of a symbolic expression in sage of the subtraction variety? (by subtraction variety I mean using the subtraction operator)

Precisely: how can I create an object o of type sage.symbolic.expression.Expression such that o.operator() is operator.sub? It seems that subtraction expressions are always converted to additions.

For example:

sage: x = var('x')
sage: (x-1).operator()
<built-in function add>