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Function Calls (with REX Protocol)
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Function `sum`
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Based on the REX protocol for function calls, function `sum`

- expects two integers parameters as input and
- returns the sum of these integers

Complete the following code fragment to do the job:

:import: session02/func_ccc.s


Computing the factorial recursively
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Write a function `factorial` that computes the factorial of a
unsigned quad-word integer recursively using the REX protocol




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