Major-Minor-Page State Machine


State             Input                                           Next 
Name              Signal       Action                             State
==========      ============  ===============================   ======================
initial         --(major)-->  echo start major,                 go to 'major started'
                --(minor)-->  err,                              go to 'initial'
                --(page)-->   err,                              go to 'initial'

major started   --(major)-->  echo end major, echo start major, go to 'major started'
                --(minor)-->  issue start minor,                go to 'minor started' 
                --(page)-->   err,                              go to 'initial'

minor started   --(major)-->  echo end minor, echo end major, echo start major, go to 'major started'
                --(minor)-->  echo end minor, echo start minor, go to 'minor started'
                --(page)-->   echo start page, echo page info   go to 'page started'

page started    --(major)-->  echo end page, echo end minor, echo end major, echo start major, go to 'major started'
                --(minor)-->  echo end page, echo end minor, echo start minor,  go to 'minor started'
                --(page)-->   echo page info,                   go to 'page started'