Structures: Rank, Thresholds, FL (First-Last mapping aka Ψ),
LCP (Longest Common Prefix), F (First column),
BWM (Burrows-Wheeler Matrix), L (Last column, which is
also the Burrows-Wheeler Transform of T),
LF (Last-First mapping), LCS (Longest Common Suffix), SA (Suffix Array), DA (Document Array)
Teal rectangular boxes in FL and LF highlight
stretches with consecutive +1 increases, which can be compressed in practice.
Red and blue rectangular boxes in BWM highlight common prefixes and suffixes.