MathDB
ASU 361 All Soviet Union MO 1983 tribe language alphabet contains 2 letters

Source:

July 28, 2019
combinatoricsWords

Problem Statement

The Abba tribe language alphabet contains two letters only. Not a word of this language is a beginning of another word. Can this tribe vocabulary contain 33 four-letter, 1010 five-letter, 3030 six-letter and 55 seven-letter words?
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