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Haskell Quiz/Index and Query

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Ruby Quiz #54:

An indexing scheme where you number all encountered words ascendingly and represent the content of a file as bit-array with the bit at position 2^i representing the i'th word.

So if you have for example:

Doc1=The quick brown fox
Doc2=Jumped over the brown dog
Doc3=Cut him to the quick

This would yield:

Doc1=00000001111
Doc2=00001110101
Doc3=11110000011

You can very quickly return the Docs that contain 'the' [ Doc1,Doc2,Doc3 ], or 'brown' [ Doc1,Doc2 ] etc.

1 The Problem

2 Solutions