# File lib/quiz1/t/solutions/Moses Hohman/cipher.rb, line 12
                def initialize(text)
                        @legal_chars_only = text.gsub(/[^A-Za-z]/, "").upcase
                        @legal_chars_only <<= "X" * (-@legal_chars_only.size % CHUNK_SIZE)
                        raise "Nothing to chunk (non-alphabet characters removed): #{text}" if @legal_chars_only.size==0
                        @chunks = []
                        @number_chunks = []
                end