86. The alterations contemplated in section 85 shall take effect as follows: those contemplated(a) in paragraph a, from registration of the change of ownership or from the date of receipt of sufficient proof;
(b) in paragraphs b and c, for the fiscal year during which the alteration is made and for each of the three previous fiscal years during which the error, omission or erroneous entry existed; such alterations shall have effect even for the fiscal years during which a former roll was in force, if it contained the error, omission or erroneous entry;
(c) in paragraph d, from the destruction, demolition or disappearance of the immoveable concerned;
(d) in paragraphs e, f and g, from the date fixed in the certificate of the assessor;
(e) in paragraph h, from their entry on the roll;
(f) in paragraph i, from the following school fiscal year in the case of a change of ownership occurring in the course of the year or in the case of a change of school boards under section 39 of the Education Act (chapter I-14) and, in other cases, from the date on which the change of ownership should have been made, up to three previous fiscal years;
(g) in paragraphs j and k, from the date fixed in the certificate of the assessor.