Didactic example. Toy example of Multi-Scale Selector of Sequence Signatures (MS4 selection of classes). On the first row (top) we see the input sequences and the output of eligible classes (MS4 classes). The second row shows the NLD re-writing from N = 1 to 5. The partition tree constructed on the basis of the re-writing is shown on the lower part of the picture. The leaves correspond to classes that contain a single site (singletons). The dotted nodes should normally disappear from the compacted tree, and are only shown for clarity's sake. The eligible classes are colored in green. Nodes are labelled with identifiers like C0_3 where C0 is an arbitrary class identifier and 3 the value of N.