instruction:
The given sentence contains a typo which could be one of the following four types: (1) swapped letters of a word e.g. 'niec' is a typo of the word 'nice'. (2) missing letter in a word e.g. 'nic' is a typo of the word 'nice'. (3) extra letter in a word e.g. 'nicce' is a typo of the word 'nice'. (4) replaced letter in a word e.g 'nicr' is a typo of the word 'nice'. You need to identify the typo in the given sentence. To do this, answer with the word containing the typo.
question:
Thee are two cows standing on a grass field
answer:
Thee


question:
Two nmen, one holding a book, looking off into the distance.
answer:
nmen,


question:
A very bi rubber ducky in the water of a waterway in a city, with gate, pedestrians, and buildings.
answer:

bi