CHAPTER IV WELFARE Article 20. - Rationing Where a rationing system exists, which applies to the population at large and regulates the general distribution of products in short supply, stateless persons shall be accorded the same treatment as nationals. Article 21. - Housing As regards housing, the Contracting States, in so far as the matter is regulated by laws or regulations or is subject to the control of public authorities, shall accord to stateless persons lawfully staying in their territory treatment as favourable as possible and, in any event, not less favourable than that accorded to aliens generally in the same circumstances. Article 22. - Public education 1. The Contracting States shall accord to stateless persons the same treatment as is accorded to nationals with respect to elementary education. 2. The Contracting States shall accord to stateless persons treatment as favourable as possible and, in any event, not less favourable than that accorded to aliens generally in the same circumstances, with respect to education other than elementary education and, in particular, as regards access to studies, the recognition of foreign school certificates, diplomas and degrees, the remission of fees and charges and the award of scholarships. Article 23. -Public relief The Contracting States shall accord to stateless persons lawfully staying in their territory the same treatment with respect to public relief and assistance as is accorded to their nationals. Article 24. - Labour legislation and social security 1. The Contracting States shall accord to stateless persons lawfully staying in their territory the same treatment as is accorded to nationals in respect of the following matters: 70