In a certain code, 'lo mi pak' means 'green tea helps', 'mi pak sur' means 'tea helps sleep', 'sur ka bin' means 'sleep well early' and 'bin dos fu' means 'early morning walk'. For which word can the code NOT be found?

Explanation

1. 01

   'tea' and 'helps' appear together in the first two sentences and nowhere else, so they share 'mi' and 'pak' with no way to split them.

2. 02

   'green' is what is left of the first sentence after 'mi' and 'pak': 'lo'. 'sleep' is in the second and third sentences: 'sur'.

3. 03

   'early' is in the third and fourth: 'bin'. The third sentence then leaves 'ka' for 'well'.

4. 04

   So only the code for 'tea' cannot be found.