1 The graph shows routes that are available to an international lorry driver. The solid arcs represent motorways and the broken arcs represent ferry crossings.
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1. Give a route from Milan to Chania involving exactly two ferry crossings. How many such routes are there?
2. Give a route from Milan to Chania involving exactly three ferry crossings. How many such routes are there?
3. Give a route from Milan to Chania using as many ferry crossings as possible, without repeating any arc.
   [0pt]
4. Give a route leaving Piraeus and finishing elsewhere which uses every arc once and only once.[3]