1. Refer to the map in Fig. 3. How many shortest routes are there from A to B that pass through the point C?

2. Refer to the map in Fig. 2. How many shortest routes are there from A to B that pass through the point C?

3. Routes through City Streets Refer to the map in Fig. 2. How many shortest routes are there from A to B that do not have two consecutive souths?

4. Routes through City Streets Refer to the map in Fig. 3. How many shortest routes are there from A to B that do not have two consecutive souths?

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