In a certain code, ‘ride’ = 3218, ‘talk’ = 7564, ‘dirt’ = 4213 and ‘like’ = 8562. Which digit represents ‘a’?

'ride' = 3218 and 'dirt' = 4213 share r, i, d ↔ 3, 2, 1, so e = 8 and t = 4. 'like' = 8562 with e = 8 and i = 2 gives l, k = 5, 6. In 'talk' = 7564, t = 4 and l, k = 5, 6, so a = 7.