Comrade Popov was taking trips to various cities.
From Warsaw he sent back a postcard:
'Greeting from Free Warsaw.'
From Czechoslovakia on the next trip he wrote:
'Greeting from Free Prague.'
He traveled on to
Bulgaria and wrote back: 'Greetings from Free Sofia';
and then to Hungary,
writing a card back: 'Greetings from Free Budapest.' Finally he reached
Vienna and wrote his last card: 'Greetings from Free Popov.'