Graph contains a "loop" a.k.a. cycle (cyclic) versus graph is acyclic.
Graphs contains a "loop" a.k.a. cycle (cyclic) versus graph is acyclic.
Graphs contains a cycle (cyclic) versus graph is acyclic.
Aaron David Fairbanks
Bongard Problems with "world" Meta Bongard Problem fitting in its own world (+BP561) vs. other Bongard Problems.
Rhetorical question: does a left example fit in its own world?