The obligations of the Guarantor are those of a primary obligor and not merely as a surety, and this Guarantee is a guarantee of performances and not merely of collection. Without limiting the generality of the foregoing, the Guarantor irrevocably, absolutely and unconditionally guarantees that if the Lessee fails to perform any of the Guaranteed Obligations, the Guarantor shall, upon receipt of the first simple demand letter, promptly perform all of the unperformed Guaranteed Obligations.