\x09 \x09 \x09 \x09\x09\x09\x09 \x09 \x09\x09\x09 \x09 \x09\x09 \x09 \x09 \x09 \x09\x09 \x09 \x09 \x09\x09\x09\x09 \x09 \x09
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
push +1(1b) push +0(0b) mark +0(0b) push +0(0b) getc mark null dup push +0(0b) retr div push +0(0b) retr copy +3(2b) div sub sub dup putc dup dup push +0(0b) retr sub jzero +0(0b) jump null