\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 \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:
mark null push +0(0b) dup geti retr dup mark +0(0b) push +91(7b) putc push +1(1b) sub dup jzero -0(0b) jump +0(0b) mark -0(0b) puti mark +0(1b) push +93(7b) putc push +1(1b) sub dup jzero +1(1b) jump +0(1b) mark +1(1b) push +10(4b) putc jump null