True: {(a,c),(c,b),(b,a),(a,d),(d,e)}, {(a,a),(a,b),(b,c),(c,d),(d,b),(d,c)}, {(a,b),(b,c),(c,d),(d,e), {(p,q),(p,s),(s,s),(r,q),(r,s)}, False: {(1,0),(0,2),(2,1),(0,3),(3,4)}, {(1,2),(1,2),(1,3),(2,3),(3,4),(4,4)}, {(k,m),(k,l),(m,n),(l,m),(l,n)},

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