In Mixed letter coding type of questions, three or four complete messages are given in the coded language and the code for a particular word is asked. To analyse such codes, any two messages bearing a common word are picked up. The common code word will mean that word. Proceeding smilarly by picking up all possible combinations of two, the entire message can be analysed.
If 'sit nro kit' stands for 'clouds pour down';
'nro bsi mit' stands for 'down he goes' and
'bsi nro zpi' stands for 'died down he',
which word would means 'goes' ?
In the first and second statements, the common code word is 'nro' and the common word is 'down'.
So, 'nro' means 'down'.
In the second and third statements, the coommon code word is 'bst' and the common word is 'he'.
So 'bsi' means 'he'.
Thus, in the second statements, 'mit' means 'goes'.