produces the results of https://en.wikipedia.org/wiki/Burrows%E2%80%93Wheeler_transform#Example in the tests
additional resources
http://www.cs.jhu.edu/~langmea/resources/bwt_fm.pdf
testing
produces the results of https://en.wikipedia.org/wiki/Burrows%E2%80%93Wheeler_transform#Example in the tests
additional resources
http://www.cs.jhu.edu/~langmea/resources/bwt_fm.pdf
testing