Solved
Two questions: (1) I accidentally entered '0' for 4b3b and now I can't get back to edit it again. Can I go back to it somehow to change it? and (2) What nonzero value(s) does it want me to enter into these 2 boxes?
If it can't be edited, you can cancel the effects by the following: in (a) insert a zero; in (c) insert a (1) and TT will end up with 0/1=0 and this will be the same as if they were all blank.
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