 Complete the following phrase:  During the time of Czechoslovakia, Československá televize ČST is known to have broadcast a number of editions of the Contest in Czechoslovakia during the 1960s and 1970s. Karel Gott, one of the most popular Czechoslovakian artist, represented Austria in the 1968 contest, held in London, United Kingdom. Furthermore, the Prague Theatre of Illuminated Drawings from the Czech capital performed as interval act in the 