There are difficulties about that . ''<br>But difficulties only sharpened the ingenuity of this admirable king .<br>`` The other fellow had a Flying Horse , '' said he .<br>By `` the other fellow '' King Prigio meant an Italian knight , Astolfo , who , in old times , visited the moon , and there found and brought back the common sense of his friend , Orlando , as you may read in the poem of Ariosto .<br>`` Now , '' reasoned King Prigio , `` if there is a Flying Horse at all , he is in the stables of the King of Delhi .<br>I must look into this . ''
King Prigio does not know if there is a Flying Horse.
The king said "if there is a flying horse at all" which means he does not know if there actually is one. 
( z0 know :ARG0 ( z1 person :name ( z2 name :op "Prigio" ) :ARG0-of ( z3 have-org-role :ARG2 ( z4 king ) ) ) :ARG1 ( z5 truth-value :polarity-of ( z6 horse :ARG0-of ( z7 fly ) ) ) :polarity - )
(z0 / know-01
    :ARG0 (z1 / person
              :name (z2 / name
                        :op1 "Prigio")
              :ARG0-of (z3 / have-org-role-91
                           :ARG2 (z4 / king)))
    :ARG1 (z5 / truth-value
              :polarity-of (z6 / horse
                               :ARG0-of (z7 / fly-01)))
    :polarity -)
King Prigio does not know if there is a Flying Horse .
z1 :name z2
z1 :ARG0-of z3
z3 :ARG2 z4
z2 :op1 1
z0 :polarity 0
z0 :ARG0 z1
z0 :ARG1 z5
z6 :ARG0-of z7
z5 :polarity-of z6