Interesting! The answer is, of course, we don't know. They didnt say to me that it was a mistake... I do believe that Im not the only person who has run into this. Berkeley did not immediately respond to a request for comment from the DCNF. So first, *please* everyone take English and humanities classes at college.
The answer is not certain so infirmary  words.
( z0 word :ARG2-of ( z1 answer ) :domain ( z2 certain :polarity - ) :mod ( z3 infirmary :degree ( z4 so ) ) )
(z0 / word
    :ARG2-of (z1 / answer-01)
    :domain (z2 / certain
                :polarity -)
    :mod (z3 / infirmary
             :degree (z4 / so)))
The answer is not certain so infirmary words .
z2 :polarity 0
z3 :degree z4
z0 :mod z3
z0 :domain z2
z0 :ARG2-of z1