In a certain code language,

'the match is over' is coded as 'fi su ki la',

'the last ball' is coded as 'du fa su',

'lost his ball' is coded as 'gy ts fa',

'they lost the match' is coded as 'gd gy su ki'

(Note: All codes are two letter codes only)

What can be the code for 'last over' in the given code language?