The constitution was first amended by constitutional laws 110/1967 (status of Prague local councils to be set by special law), 28/1968 (similar for Bratislava), the Constitutional Law of Federation 143/1968 and accompanying 144/1968 on ethnic minorities, and further by constitutional laws 57/1969 (local councils put into the authority of national republics), 155/1969 (court reform), 43/1971 (elected bodies term of office prolonged to 5 years from 4), 50/1975 (this actually affected only the Constitutional Law of Federation, into which the Presidency had been moved: President unable to carry out his duties over a year can be replaced, i. e. ill Ludvík Svoboda with Gustáv Husák), 62/1978 (a minor change about schooling, see below), 135/1989 (leading role of the KSČ abolished etc.) and several times during 1990–1992 (e. g. 102/1990 change of the national symbols - the constitutional laws changing the country's name twice weren't formally amendments to the constitution; 23/1991 incorporation of the human rights charter that replaced the Chapter 2 below, etc.).