\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 +0(0b) dup getc retr mark null dup dup dup dup dup putc getc retr putc getc retr putc jump null