In a code language, 'people are confident' is written as 'lur bur duk', 'we are helpful' is written as 'kur duk sur', 'we have cars' is written as 'sur mur jur' and 'people have honesty' is written as 'lur jur nur'. What is the code for 'confident'?

'people are confident' ==> 'lur bur duk'    Eq.(i)
'we are helpful' ==> 'kur duk sur'    Eq.(ii)

'we have cars' ==> 'sur mur jur'    Eq.(iii)

'people have honesty' ==> 'lur jur nur'    Eq.(iv)

From Eq.(i) and Eq.(iv), 'people' is common. So the code for this will be 'lur'.

From Eq.(i) and Eq.(ii), 'are' is common. So the code for this will be 'duk'.

Now Eq.(i), 'confident' is remaining. So the code for this will be 'bur'.