This file contains a list of predicate definitions that will automatically
be read into Mini Prolog at the beginning of a session.  Each clause in this
file must be entered on a single line and lines containing syntax errors are
always ignored.  This includes the first few lines of this file and provides
a simple way to include comments.

append(nil,X,X).
append(cons(X,Y),Z,cons(X,W)):==append(Y,Z,W).

equals(X,X).

not(X):==X,!,false.
not(X).

or(X,Y):==X.
or(X,Y):==Y.

true.

End of stdlib