Write a cross-referencer that prints a list of all words in a document, and for each word, a list of the line numbers on which it occurs. Remove noise words like "the," "and," and so on.
A word is a run of letters, taken in lower case; the noise words are a an and in is it of or the to. Print each word in alphabetical order on a line of its own, followed by the numbers of the lines it's on, in increasing order and each once, separated by blanks: apple 1 3 5. Lines are numbered from 1.
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