Take for example the class of cases of detention where no declaration has been made under sub sections (2) and (3) of section 16A. This category would cover cases where orders of detention have been passed 462 prior to June 25, 1975, because in such cases no declaration under subsections (2) or (3) of section 16A is contemplated and it would also cover the rather exceptional cases where orders of detention have been made after 25th June, 1975 without a declaration under sub section (2) or sub section (3) of section 16A. Sections 8 to 12 would continue to apply in such cases and consequently the detaining authority would be under an obligation to refer the case of the detenu to the Advisory Board and if the Advisory Board reports that there is in its opinion no sufficient cause for the detention of the detenu, the State Government would be bound to revoke the detention order and release the detenu. 'That is the plain requirement of sub section (2) of section.