data/advent07b.txt

   1 shiny gold bags contain 2 dark red bags.
   2 dark red bags contain 2 dark orange bags.
   3 dark orange bags contain 2 dark yellow bags.
   4 dark yellow bags contain 2 dark green bags.
   5 dark green bags contain 2 dark blue bags.
   6 dark blue bags contain 2 dark violet bags.
   7 dark violet bags contain no other bags.