17. Compulsion by husband. A married woman is not free from criminal responsibility for doing or omitting to do an act merely because the act or omission takes place in the presence of her husband; but on a charge against a wife for any offence other than treason or murder, it shall be a good defence to prove that the offence was committed in the presence of, and under the coercion of, the husband. 18. Person not to be punished twice for same offence. A person shall not be punished twice either under this Code or under any other law for the same offence. CHAPTER IV—PARTIES TO AND PERSONS INCITING TO COMMIT OFFENCES. 19. Principal offenders. (1) When an offence is committed, each of the following persons is deemed to have taken part in committing the offence and to be guilty of the offence and may be charged with actually committing it— (a) every person who actually does the act or makes the omission which constitutes the offence; (b) every person who does or omits to do any act for the purpose of enabling or aiding another person to commit the offence; (c) every person who aids or abets another person in committing the offence. (2) Any person who procures another to do or omit to do any act of such a nature that if he or she had done the act or made the omission the act or omission would have constituted an offence on his or her part, is guilty of an offence of the same kind and is liable to the same punishment as if he or she had done the act or made the omission; and he or she may be charged with doing the act or making the omission. 20. Joint offenders in prosecution of common purpose. When two or more persons form a common intention to prosecute an unlawful purpose in conjunction with one another, and in the prosecution of that purpose an offence is committed of such a nature that its commission was a probable consequence of the prosecution of that purpose, each of them is deemed to have committed the offence.