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.
In a certain language, 'po ki top ma' means 'Usha is playing cards' ;
'kop ja ki ma' means 'Asha is playing tennis' ;
'ki top sop ho' means 'they are playing football' ;
and 'po sur kop' means 'cards and tennis' ;
Which word in that language means 'Asha' ?
In the first and second statements, the common code words are 'ki' and 'ma' and the common words are 'is' and 'playing'.
So, 'ki' and 'ma' are the codes for 'is' and 'playing'.
In the second and fourth statements, the common code word is 'kop' and the common word is 'tennis'.
So, 'kop' stands for 'tennis'.
Thus, in the second statement, 'ja' stands for 'Asha'.