@Chhote Lal: Sir, I agree, any sane person will think and talk like what you said. There (in an ideal world) is no particular pattern in which only particular PAN/DEMANT ACCOUNTS are last 2.5 years, and the observations are really forming pattern., and visibly a possibility that some kind of manual intervention is happening or method used to allocate is manually coded (and not natural random selections)..
And thank you, have been quite lucky with mainboard IPOs since one year. SME me bad luck hai bass.