Once Susan had told him that if he touched his tongue to a frosty latch all the skin would tear off it .<br>Jem had promptly done it , `` just to see if it was so . ''<br>He found it was `` so , '' at the cost of a very sore tongue for several days .<br>But Jem did not grudge suffering in the interests of science .
Susan and Jem are both adults.
The text does not describe the ages of the two people involved in this "experiment", so they can be children or adults.
( z0 adult :domain ( z1 and :mod ( z2 both ) :op ( z3 person :name ( z4 name :op "Susan" ) ) :op ( z5 person :name ( z6 name :op "Jem" ) ) ) )
(z0 / adult
    :domain (z1 / and
                :mod (z2 / both)
                :op1 (z3 / person
                         :name (z4 / name
                                   :op1 "Susan"))
                :op2 (z5 / person
                         :name (z6 / name
                                   :op1 "Jem"))))
Susan and Jem are both adults .
z3 :name z4
z4 :op1 1
z1 :op1 z3
z1 :op2 z5
z5 :name z6
z6 :op1 0
z1 :mod z2
z0 :domain z1