“Subparagraph (b) establishes a secondary criterion for two quite distinct and different situations: (a) the case where the individual has a permanent home available to him in both Contracting States and it is not possible to determine in which one he has his centre of vital interests; (b) the case where the individual has a permanent home
a) El caso de que la persona física disponga de una vivienda permanente en ambos Estados contratantes y no sea posible determinar en cuál tiene su centro de intereses vitales;