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'.