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RA-Stack Access

The advertised way to access an element of the stack is through: 
     (top-minus ra-stack offset)

If offset = 0, then calculate the stack location by: 

     (height ra-stack) - 1
If offset > 0, then: 
     (height ra-stack) - 1 - offset
or equivalently: 
     (height ra-stack) - (offset + 1)
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