Normalization
	• Write Bayes' Rule for P(M|S) • Now write Bayes' Rule for P(ØM|S) • We know P(M|S) + P(ØM|S) = 1 • Use these to write a new expression for P(S) • Substitute this expression in Bayes' Rule for P(M|S) • One does not need P(S) directly.