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English words are made of 26 letters, and palindromes and anagrams are two kinds of word games about spelling. A palindrome is a word or a sentence that reads the same from left to right or from right to left, __40__, "eye," "Bob," "my gym," and "Was it a car or a cat I saw?" An anagram of a word or words is made by putting the letters of the word or words in a different way. Look at the words and their anagrams below. Can you think of other possible anagrams of these words? （A table of words and their anagrams, including blank __41__, is shown here as an image.） Anagrams are often longer words that don't really mean anything but are fun to say. Sometimes they can even mean something __42__, like when a common word, "restaurant," becomes "Eat rats, run!" Actually, palindromes and anagrams are __43__. Palindromes can be used to learn mathematics and make music. Anagrams are also a good way to hide something. In history, people often hid their important studies in anagrams. Can you think of any other way to use them?