start with worst prob
avoid (random 0)
bug fix, wrong indexing
more verbose
wrongly indexed
fix indetation
fix, normalize newPE
dumb method for hmm-correct-p
l & r start from 0
less stark
l & r start from 0 (CONT.)
fixed wrong drvation
space
minor
fix computation of B
fix
fix for pi
for now optimise safety
start of hmm-correct-p