(format t"~15@{~18@{ a~}~15@{ b~}
~}~3@{~18@{ a~}~7@{ c~}~8@{ d~}
~}~4@{~14@{ e~} f f f f~7@{ c~}~8@{ d~}
~}~14@{ e~}~10@{ g~} h~8@{ d~}
~9@{~14@{ e~}~10@{ g~}~9@{ i~}
~}"t)
Note that non-ascii characters in the above source code will be escaped (such as \x9f).