PUSH1 0x11
PUSH1 0x01
PUSH1 0xf
PUSH1 0xe
PUSH1 0xd
PUSH1 0xc
PUSH1 0xb
PUSH1 0xa
PUSH1 0x9
PUSH1 0x8
PUSH1 0x7
PUSH1 0x6
PUSH1 0x5
PUSH1 0x4
PUSH1 0x3
PUSH1 0x2
PUSH1 0x1

SWAP16

# return result
PUSH1 0x0
MSTORE
PUSH1 0xff
PUSH1 0x00
RETURN