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    MG4J
        
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                        | MG4J (Managing Gigabytes for Java) is a collaborative effort aimed at providing a free Java implementation of inverted-index compression techniques; as a by-product, it offers several general-purpose optimised classes, including fast and compact mutable strings, bit-level I/O, fast unsynchronised buffered streams, (possibly signed) minimal perfect hashing, etc. MG4J functions as a full-fledged text-indexing system. It can analyze, index, and query consistently large document collections. 
 
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            | Category | Search Engines |  
            | License | GNU Library or Lesser General Public License (LGPL) |  
            | HomePage | http://mg4j.dsi.unimi.it/ |  | 
 
 
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