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+--- Part Two ---
+
+As you finish the last group's customs declaration, you notice that you misread one word in the
+instructions:
+
+You don't need to identify the questions to which anyone answered "yes"; you need to
+identify the questions to which everyone answered "yes"!
+
+Using the same example as above:
+
+abc
+
+a b c
+
+ab ac
+
+a a a a
+
+b
+
+This list represents answers from five groups:
+
+- In the first group, everyone (all 1 person) answered "yes" to 3 questions: a, b, and
+c. - In the second group, there is no question to which everyone answered "yes". - In
+the third group, everyone answered yes to only 1 question, a. Since some people did not
+answer "yes" to b or c, they don't count. - In the fourth group, everyone answered yes to only
+1 question, a. - In the fifth group, everyone (all 1 person) answered "yes" to
+1 question, b.
+
+In this example, the sum of these counts is 3 + 0 + 1 + 1 + 1 = 6.
+
+For each group, count the number of questions to which everyone answered "yes".
+What is the sum of those counts?
+
+