This lecture was spent going over what I expect for assignment 5 and answering questions. The due date was extended to 6pm Friday.

I explained that the OIC simulator that you are writing is an
interpreter: if you want to run another OIC program, all you will have
to change should be the `.word` directives in the
`.data` section (except for perhaps the initial OIC program
counter, if you are not always starting at zero).

You should think about whether borrows can occur when you subtract the
borrow from the previous digit. If so, you should consider whether
*two* borrows could occur, once from the subtraction of the
previous borrow, and once from the subtraction of the current digit.
If you can give a definitive answer -- and prove why it is correct --
then you understand how to do multiprecision subtraction.

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