definiens: means the Landlord and Tenant ( Covenants ) Act 1995 1.2 Words or phrases which are defined in the Sub - Underlease shall unless the context otherwise requires have a similar meaning when used in this Deed and any interpretations referred to in the Sub - Underlease shall also apply to this Deed 1.3 Where the Former Tenant comprises 2 or more persons or corporations their liability shall be joint and several 1.4 Words importing the singular meaning shall where the context so admit include the plural meaning and vice versa 2 . Authorized Guarantee Agreement 2.1 This Deed is an Authorized Guarantee Agreement for the purposes of the 1995 Act and the circumstances set out in section 16(3 ) ofthe 1995 Act apply 3 . The Former Tenant 's covenants 3.1 The Former Tenant covenants and undertakes with the Landlord that : ( a ) The Assignee will during the Relevant Period punctually pay the rent(s ) reserved by and comply with all the tenant 's covenants being relevant covenants contained in the Sub - Underlease ( b ) -The Former Tenant will pay and make good to the Landlord on demand and will indemnify the Landlord against all losses costs expenses and damages occasioned by or resulting from the Assignee 's failure during the Relevant Period to comply with any obligation owed by the Assignee in respect of the relevant covenants ( c ) If during the Relevant Period the Sub - Underlease is disclaimed and the Landlord within 6 months of such disclaimer by notice in writing to the Former Tenant so requires the Former Tenant will accept and execute a counterpart of a lease of the Premises for a term equal to the residue of the CONFIDENTIAL TREATMENT REQUESTED BY AVIRON [ ) -CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, IS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO RULE 24B-2 OF THE SECURITIES ACT OF 1934, AS AMENDED