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3

The grounds of the zoo, with one bridge, So, with sufficient abstraction, the following diagram shows how to do it I appreciate that so here is how to transform that into something more obvious. First and then


4

Four monuments Easy map to draw: Or, topologically equivalently (and more usefully for our purposes): Five monuments Starting from the last map above: Seven monuments Starting from the five-monument map above:


1

For the top problem and for the bottom problem And in case my vocab didn't give me away, I am rather fond of graph theory. ^_^ Thinking of general audiences,


2

To the upper pair:


0

Some observations on the first twelve graphs:


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