One point per correct adjacent pair
If the correct order is 2-4-3-1-5 and you submit 2-4-1-3-5, the pairs 2-4 and 3-5 are… not quite: 2-4 is correct, 4-1 is wrong, 1-3 is wrong, 3-5 is wrong. One point. Submit 2-4-3-5-1 instead and 2-4 and 4-3 are right: two points. Every correct link earns, no matter what happens elsewhere.
