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Now let's draw the transitions. We could draw arrows that have a direction so that they point from one node to another, but in this puzzle the transitions are symmetric: if the robot can row from state NNNN to state FNFF, it can equally well row the other way from FNFF to NNNN. Thus it is simpler to draw the transitions simply with lines that don't have a direction. Starting from NNNN, we can go to FNFN, FNFF, FFNF, and FFFN: