040000 tree 7e8abfb4d3481096cd2e58dac5e469e27567d399	gregbook
040000 tree e685c78a153aebefc03a32d593efa415c1be991b	pngminus
040000 tree 79c432701cd6280e17fd2bf5c66118be5e797319	pngsuite
040000 tree ea957597f98f3105debf4f92e65ee1b5a2ee1625	visupng