
	father(terach,abraham).		father(haran,lot).			
	father(terach,nachor).		father(haran,milcah).			
	father(terach,haran).		father(haran,yiscah).	
	father(abraham,isaac).			
	male(abraham).		male(haran).	female(yiscah).	
	male(isaac).		male(nachor).	female(milcah).
	male(lot).

%	Program 16.1:   Sample data
