DNA oligomers: All posible DNA words between 3 to 6 nucleotides can be used to discover putative new functional motifs. Depending on the size and strand selected there are diferent number (N) of posible DNA words.

SIZE	N STRAND FORWARD	N PALINDROMES	N NON PALINDROMES	N STRAND BOTH
3	64	0	32	32
4	256	16	120	136
5	1024	0	512	512
6	4096	64	2016	2080

For example, selecting size=4 and strand=both in a dataset of plant promoters extracted from EPD, 3 out of 136 posibles oligomers were significant with p-values < 1e-20. TATA, ATAG & ATAA (or ATAT, CTAT & TTAT) show positional overrepresentation between -20 to -40 relative to the transcription start site. These 3 tetramers correspond to the core binding motif for the TBP.