If I understand correctly, "positive blame" refers to servers and "negative
blame" refers to clients.  I think this means:

(define/contract (add-10 x) (-> number? number?) "oops")
(add-10 7)        ; Call-A
(add-10 "oops")   ; Call-B

`add-10` accepts a number and promises to return a number, but it actually
returns a string.  Therefore:

Call-A:   positive blame on add-10, no negative blame
Call-B:   negative blame on the (add-10 "oops") call, no positive blame.

Do I have this right, or does every exception carry both positive and
negative blame?

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