Trustee Ordinance

upon trust for the principal beneficiary during the trust period or until
                    he, whether before or after the termination of any prior interest, does or
                    attempts to do or suffers any act or thing, or until any event happens, other
                    than an advance under any statutory or express power, whereby, if the said
                    income were payable during the trust period to the principal beneficiary
                    absolutely during that period, he would be deprived of the right to receive the
                    same or any part thereof, in any of which cases, as well as on the termination
                    of the trust period, whichever first happens, this trust of the said income
                    shall fail or determine;