I am a document containing some logical chunks ..... SHINGLE IT LIKE THIS I am a document am a document containing a document containing some document containing some logical containing some logical chunks ..... HASH THE SHINGES 1ba00000 f8840000 e19a0000 c6ca0000 82ce0000 ..... SORT THE SHINGLES SUCH THAT ..... WE CAN TAKE A PSEUDORANDOM SELECTION OF THEM, SAY THE FIRST N ~ 20 1ba00000 <-- lets take this first one 82ce0000 <-- and this next one c6ca0000 <-- and this one, but discard rest..... e19a0000 f8840000 .....