Example of Rule Induction[Quinlan, ``Learning Efficient Classification Procedures'', Machine Learning, Morgan Kaufmann Publ., 1983.]

Classifications	=	{ +, -}
Features	=	{size, shape, color}
Domains:
size	=	{large, small}
shape	=	{square, triangle, circle}
color	=	{blue, red}

Training set:
small, circle, blue: +
small, square, blue: -
large, square, red: -
large, circle, red: -
large, square, blue: -
small, circle, red: -
large, triangle, blue: +
large, circle, blue: +