Does the Medic remove all cubes of cured diseases from the cities he travels through? Let's say he:
- drives to one city (3 cured cubes)
- drives to another city (2 cured cubes)
- drives to another city (1 cured cube)
- drives to another city (1 cured cube)
does he remove all 7 cubes on the way or just at the last city?