serial & branch                               seaman          mechanical   secretariat        supply         electrical    radio electrical      regulating           medical
0                1               od ( ordinary seaman )               me ii        wtr ii         sa ii              en ii              ren ii           pm ii             ma ii
1                2                   ab ( able seaman )                me i         wtr i          sa i               en i               ren i            pm i              ma i
2                3                ls ( leading seaman )                 lme          lwtr           lsa                len                lren             lpm               lma
3                4                 po ( petty officer )            era - iv        po (w)        po (s)            ea - iv            rea - iv          po (r)          po (med)
4                5          cpo ( chief petty officer )  era - i / ii / iii       cpo (w)       cpo (s)  ea - i / ii / iii  rea - i / ii / iii       cpo (reg)         cpo (med)
5                6  scpo ( senior chief petty officer )     scpo (e) , cera      scpo (w)      scpo (s)     scpo (l) , cea     scpo (r) , crea      scpo (reg)        scpo (med)
6                7  mcpo ( master chief petty officer )            mcpo (e)      mcpo (s)      mcpo (s)           mcpo (l)            mcpo (r)      mcpo (reg)        mcpo (med)
7                8          honorary sub lieutenant (x)        hon s lt (e)  hon s lt (s)  hon s lt (s)       hon s lt (l)        hon s lt (r)  hon s lt (reg)  hon s lt (w / m)

Table as JSON:
{"serial & branch":{"0":1,"1":2,"2":3,"3":4,"4":5,"5":6,"6":7,"7":8},"seaman":{"0":"od ( ordinary seaman )","1":"ab ( able seaman )","2":"ls ( leading seaman )","3":"po ( petty officer )","4":"cpo ( chief petty officer )","5":"scpo ( senior chief petty officer )","6":"mcpo ( master chief petty officer )","7":"honorary sub lieutenant (x)"},"mechanical":{"0":"me ii","1":"me i","2":"lme","3":"era - iv","4":"era - i \/ ii \/ iii","5":"scpo (e) , cera","6":"mcpo (e)","7":"hon s lt (e)"},"secretariat":{"0":"wtr ii","1":"wtr i","2":"lwtr","3":"po (w)","4":"cpo (w)","5":"scpo (w)","6":"mcpo (s)","7":"hon s lt (s)"},"supply":{"0":"sa ii","1":"sa i","2":"lsa","3":"po (s)","4":"cpo (s)","5":"scpo (s)","6":"mcpo (s)","7":"hon s lt (s)"},"electrical":{"0":"en ii","1":"en i","2":"len","3":"ea - iv","4":"ea - i \/ ii \/ iii","5":"scpo (l) , cea","6":"mcpo (l)","7":"hon s lt (l)"},"radio electrical":{"0":"ren ii","1":"ren i","2":"lren","3":"rea - iv","4":"rea - i \/ ii \/ iii","5":"scpo (r) , crea","6":"mcpo (r)","7":"hon s lt (r)"},"regulating":{"0":"pm ii","1":"pm i","2":"lpm","3":"po (r)","4":"cpo (reg)","5":"scpo (reg)","6":"mcpo (reg)","7":"hon s lt (reg)"},"medical":{"0":"ma ii","1":"ma i","2":"lma","3":"po (med)","4":"cpo (med)","5":"scpo (med)","6":"mcpo (med)","7":"hon s lt (w \/ m)"}}