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+--- Day 6: Custom Customs ---
+
+As your flight approaches the regional airport where you'll switch to a much larger plane, customs
+declaration forms are distributed to the passengers.
+
+The form asks a series of 26 yes-or-no questions marked a through z. All you need to do is identify
+the questions for which anyone in your group answers "yes". Since your group is just
+you, this doesn't take very long.
+
+However, the person sitting next to you seems to be experiencing a language barrier and asks if you
+can help. For each of the people in their group, you write down the questions for which they answer
+"yes", one per line. For example:
+
+abcx abcy abcz
+
+In this group, there are 6 questions to which anyone answered "yes": a, b, c, x, y, and
+z. (Duplicate answers to the same question don't count extra; each question counts at most once.)
+
+Another group asks for your help, then another, and eventually you've collected answers from every
+group on the plane (your puzzle input). Each group's answers are separated by a blank line, and
+within each group, each person's answers are on a single line. For example:
+
+abc
+
+a b c
+
+ab ac
+
+a a a a
+
+b
+
+This list represents answers from five groups:
+
+- The first group contains one person who answered "yes" to 3 questions: a, b, and c. -
+The second group contains three people; combined, they answered "yes" to 3 questions:
+a, b, and c. - The third group contains two people; combined, they answered "yes" to 3
+questions: a, b, and c. - The fourth group contains four people; combined, they answered "yes" to
+only 1 question, a. - The last group contains one person who answered "yes" to only
+1 question, b.
+
+In this example, the sum of these counts is 3 + 3 + 3 + 1 + 1 = 11.
+
+For each group, count the number of questions to which anyone answered "yes". What is the
+sum of those counts?
+
+