Instances:	a set of training instances
Features:	feature vector (f1, f2, ..., fn) input from teacher
Domains:	set of domains for Features {d1, d2, ..., dm}
Classes:	set of classes {c1, c2, ..., ck}
	(simply {+, -} for single concept learning.)

Function formrule (Instances, Features, Domains, Classes)
For some class &isin Classes
If all members of Instances fall into class
then return class
else f &larr select-feature (Features, Instances)
d &larr domain from set Domains corresponding to f
return a tree of the form:

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