This class represents a couple (tolerance-occurrences), where tolerance is the tolerance value used to compute typical sequences in an ExpTypSeqProf experiment
and occurrences is the array containing in cell i the number of occurrences of typical sequences having a certain length (the length is contained in array length[i]
in ExpTypSeqProf).
The purpose of this inner class is to provide a
wrapper for the three critical data values that
are produced during implementation of the LZ77
compression algorithm.