$ mkvtree -protein -db swissp.sp.gz -pl -lcp -suf -tis -ois -bwt -bck -v
reading gzipped file "swissp.sp.gz"
maximal value for argument of option -pl is 2, recommended value is 2
total length of sequences: 4566 (including 7 separators)
alphabet of size 21: LVIFKREDAGSTNQYWPHMCX
creating file "swissp.sp.gz.tis"
creating file "swissp.sp.gz.ois"
creating file "swissp.sp.gz.des"
creating file "swissp.sp.gz.sds"
creating file "swissp.sp.gz.lcp"
initializing data structures
sorting suffixes according to prefix of length 2
sorting all buckets
creating file "swissp.sp.gz.llv"
creating file "swissp.sp.gz.bck"
creating file "swissp.sp.gz.suf"
creating file "swissp.sp.gz.bwt"
creating file "swissp.sp.gz.prj"
creating file "swissp.sp.gz.al1"
overall space peak: main=0.18 MB (40.80 bytes/symbol), secondary=0.00 MB
