040000 tree 247ae1bb1b09d71d06851d7602263cd8d2e241ca	gregbook
040000 tree d9e8da18f88dd4598503053d207807dab5c235d4	pngminim
040000 tree e685c78a153aebefc03a32d593efa415c1be991b	pngminus
040000 tree 79c432701cd6280e17fd2bf5c66118be5e797319	pngsuite
040000 tree 15120113ade41f0b769a09283a6f932af3ec3918	visupng