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/*task 1*/ main:- person(william). person(edith). person(gabrielle). person(raj). person(sasha). person(andrei). person(tom). person(fuchu). friend(william, raj). friend(raj, william). /*This ensures that raj and william are bidirectional friends */ friend(raj, gabrielle). friend(gabrielle,raj). friend(sasha,tom). friend(tom,sasha). notfriend(andrei,gabrielle). friends(A,B):- friend(A,B);friend(B,A).