Seven persons visited a doctor for consultation, one after another.

i. Mahesh visited immediately after Amit but sometime before Virat.

ii. Ashok visited just after Virat and just before Naman.

iii. Neither Anup nor Naman was the last to visit.

iv. There were as many visitors between Ashok and Suraj as there were between Anup and Ashok.

Who were the first and the last persons to have visited the doctor, respectively