|First, assert a node with a misspelling.|
Since this will be the second node you will have asserted, SNePS will call it `M2'.
|Then erase M2|
|and assert what we wanted without
any misspellings (be careful!):
(assert member Clyde class ephalunt) (erase m2) (assert member Clyde class elephant)
SNePS should have simply returned node M1, since we had
already built it, and, by the Uniqueness Principle, SNePS does
not build or assert nodes more than once (UM§3.1.2).
Thus, instead of building
another representation of the proposition that Clyde is an elephant,
Cassie showed us that she already believed that.