Background Motif patterns of maximal saturation emerged originally in contexts of pattern
discovery in biomolecular sequences and have recently proven a valuable notion also in the
design of data compression schemes. Informally, a motif is a string of intermittently solid and
wild characters that recurs more or less frequently in an input sequence or family of
sequences. Motif discovery techniques and tools tend to be computationally imposing,
however, special classes of" rigid" motifs have been identified of which the discovery is …