13. Five swimmers are eligible to compete in a relay team which is to consist of four swimmers swimming four different swimming styles; back stroke, breast stroke, free style and butterfly. The time taken for the five swimmers-Anand, Bhaskar, Chandru, Dorai and Eswar-to cover a distance of 100 metres in various swimming styles are given below in minutes and seconds. Anand swims the back stroke in 1 :09, the breast stroke in 1: 15 and has never competed in the free style or butterfly. Bhaskar is a free style specialist averaging 1:01 for the 100 metres but can also swim the breast stroke in 1: 16 and butterfly in 1 :20. Chandru swims all styles-back 1: 10, butterfly 1: 12, free style 1 :05 and breast stroke 1 :20. Dorai swims only the butterfly 1: 11, while Eswar swims the back stroke 1 :20, the breast stroke 1:16, the free style 1:06 and the butterfly 1:10. Which swimmers should be assigned to which swimming style? Who will not be in the relay?