(1) (a) What oil rigs do PetroSA own and (b) in each case, (i) when was it acquired, (ii) at what cost was it acquired and (iii) what is the monthly maintenance cost; (2) (a) what oil rigs do PetroSA lease and (b) in each case, (i) what is the period of the lease and (ii) at what cost is it leased?