In a certain language, 'pre nat bis' means 'smoking is harmful';
'vog dor nat' means 'avoid harmful habit' and
'dor bis yel' means 'please avoid smoking'.
Which of the following means 'habit' in that language ?
In the first and second statements, the common code word is 'nat' and the common word is 'harmful'.
So, 'nat' stands for 'harmful'.
In the second and third statements, the common code word is 'dor' and the common word is 'avoid'.
So, 'dor' stands for 'avoid'.