Comparability of the Situations of Permanent Invalidity (Total, Absolute and Severe) to a Disability Degree Equal to or Greater Than 33 %, Ex Art. 4.2 of R.D. Legislative 1 2013, Which Approves the Revised Text of General Law of Rights of Persons With Disabilities and Their Social Inclusión, or the Becoming Ultra Vires of an Impertinent Rule. revsegsoc 2019, No. 19, 95-111.