Succinct Suffix Array
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SSA   : 
       -First version.
SSA_v2: 
       -Some changes in the implementation of the wavelet tree. This improves 
        the following queries: count,locate,display,extract.
SSA_v3: 
       -Some changes in the implementation of the display query. 
       -Now the samples for the suffix array and the text can be set 
        independently.
SSA_v3.1: 
       -Now no Huffman code can be longer than 32 bits
SSA2  : 
       -A new implementation of the display query. Now you do not need
        any sampling to do display.
       -Now the samples for the suffix array and the text can be set 
        independently.
SSA2_v1.1: 
       -Now no Huffman code can be longer than 32 bits