Also clause 16 of the Debenture Trust Deed authorises the debenture trustees to intervene 99 and crystallise the charge in their favour, inter alia, in the following circumstances: "If the Company sells the Mortgaged Premises or any part thereof not in the ordinary course of business except a sale, transfer or dispo sition allowed under the terms of these presents to be made with the consent of the Trustees." (Sub clause (f)) "If the Company (except as hereinafter ex pressly provided) creates or attempts or purports to create any charge or mortgage of the Mortgaged Premises or any part of parts thereof prejudicial to the interests of the Debentureholders." (Sub Clause (i)) "If, in the opinion of the Trustees, the security of the Debentureholders is in jeop ardy." (Sub clause (k)) Thus if at any time the company proposes to create such higherranking charges, the trustees for debenture holders can stultify the same by taking immediate action.