Which of the following can be transferred under the Transfer of Property Act?

A decree for mesne profits is a crystallized judgment debt and not a 'mere right to sue', so it can be validly transferred (and executed by the assignee under Order XXI, Rule 16 of the Code of Civil Procedure, 1908). By contrast, a mere right to sue for unascertained mesne profits is non-transferable under Section 6(e) of the Transfer of Property Act, 1882, while a transfer for future illicit cohabitation and a sub-lease for the retail sale of opium in contravention of law are barred under Section 6(h) as transfers for an immoral or unlawful object or consideration.