Why hyphen is used to number section 194-I, 194-IA, 194-IB, 194-IC and 115-O

CA Stalin (CA in Full time practice)   (232 Points)

05 September 2017  

Almost in all other sections of the Income Tax Act,1961 hyphen is not used to number the sections except 194-I, 194-IA, 194-IB, 194-IC and 115-O

Anyone know the reason?

Though this not much important, just curious to know the history behind this "-"(Hyphen)