SNPs detection by eBWT positional clustering

If no value k < r guarantees that G [ i + 1 , i + k ] appears only once in G, then the eBWT cluster of i does not contain only read-copies of G[i] but also those of other t - 1 characters G [ i 2 ] , ？ , G [ i t ] . We call t the multiplicity of the eBWT cluster. Note that t = 1 for non-ambiguous clusters